diff --git a/lib/duktape-stub/src/com/squareup/duktape/Duktape.java b/lib/duktape-stub/src/com/squareup/duktape/Duktape.java
index d3d75cb02..12bdb0252 100644
--- a/lib/duktape-stub/src/com/squareup/duktape/Duktape.java
+++ b/lib/duktape-stub/src/com/squareup/duktape/Duktape.java
@@ -19,4 +19,8 @@ public class Duktape implements Closeable {
         throw new RuntimeException("Stub!");
     }
 
+    public synchronized <T> void set(String name, Class<T> type, T object) {
+        throw new RuntimeException("Stub!");
+    }
+
 }
\ No newline at end of file
diff --git a/src/en/mangaplus/build.gradle b/src/en/mangaplus/build.gradle
new file mode 100644
index 000000000..0c3cd1eeb
--- /dev/null
+++ b/src/en/mangaplus/build.gradle
@@ -0,0 +1,18 @@
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+ext {
+    appName = 'Tachiyomi: Manga Plus by Shueisha'
+    pkgNameSuffix = 'en.mangaplus'
+    extClass = '.MangaPlus'
+    extVersionCode = 1
+    libVersion = '1.2'
+}
+
+dependencies {
+    compileOnly 'com.google.code.gson:gson:2.8.2'
+    compileOnly 'com.github.salomonbrys.kotson:kotson:2.5.0'
+    compileOnly project(':duktape-stub')
+}
+
+apply from: "$rootDir/common.gradle"
diff --git a/src/en/mangaplus/res/mipmap-hdpi/ic_launcher.png b/src/en/mangaplus/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 000000000..b45b3b731
Binary files /dev/null and b/src/en/mangaplus/res/mipmap-hdpi/ic_launcher.png differ
diff --git a/src/en/mangaplus/res/mipmap-mdpi/ic_launcher.png b/src/en/mangaplus/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 000000000..c5f3e011c
Binary files /dev/null and b/src/en/mangaplus/res/mipmap-mdpi/ic_launcher.png differ
diff --git a/src/en/mangaplus/res/mipmap-xhdpi/ic_launcher.png b/src/en/mangaplus/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 000000000..9d015bbd7
Binary files /dev/null and b/src/en/mangaplus/res/mipmap-xhdpi/ic_launcher.png differ
diff --git a/src/en/mangaplus/res/mipmap-xxhdpi/ic_launcher.png b/src/en/mangaplus/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 000000000..7531908d2
Binary files /dev/null and b/src/en/mangaplus/res/mipmap-xxhdpi/ic_launcher.png differ
diff --git a/src/en/mangaplus/res/mipmap-xxxhdpi/ic_launcher.png b/src/en/mangaplus/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 000000000..601ff6a62
Binary files /dev/null and b/src/en/mangaplus/res/mipmap-xxxhdpi/ic_launcher.png differ
diff --git a/src/en/mangaplus/res/web_hi_res_512.png b/src/en/mangaplus/res/web_hi_res_512.png
new file mode 100644
index 000000000..8382e05ea
Binary files /dev/null and b/src/en/mangaplus/res/web_hi_res_512.png differ
diff --git a/src/en/mangaplus/src/eu/kanade/tachiyomi/extension/en/mangaplus/MangaPlus.kt b/src/en/mangaplus/src/eu/kanade/tachiyomi/extension/en/mangaplus/MangaPlus.kt
new file mode 100644
index 000000000..452d0aacf
--- /dev/null
+++ b/src/en/mangaplus/src/eu/kanade/tachiyomi/extension/en/mangaplus/MangaPlus.kt
@@ -0,0 +1,394 @@
+package eu.kanade.tachiyomi.extension.en.mangaplus
+
+import com.github.salomonbrys.kotson.*
+import com.google.gson.JsonObject
+import com.google.gson.JsonParser
+import com.squareup.duktape.Duktape
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.asObservableSuccess
+import eu.kanade.tachiyomi.source.model.*
+import eu.kanade.tachiyomi.source.online.HttpSource
+import okhttp3.*
+import rx.Observable
+import java.lang.Exception
+
+class MangaPlus : HttpSource() {
+    override val name = "Manga Plus by Shueisha"
+
+    override val baseUrl = "https://jumpg-webapi.tokyo-cdn.com/api"
+
+    override val lang = "en"
+
+    override val supportsLatest = true
+
+    private val catalogHeaders = Headers.Builder().apply {
+        add("Origin", WEB_URL)
+        add("Referer", WEB_URL)
+        add("User-Agent", USER_AGENT)
+        add("X-Requested-With", "XMLHttpRequest")
+    }.build()
+
+    override val client = network.client.newBuilder().addInterceptor {
+        var request = it.request()
+
+        if (!request.url().queryParameterNames().contains("encryptionKey")) {
+            return@addInterceptor it.proceed(request)
+        }
+
+        val encryptionKey = request.url().queryParameter("encryptionKey")!!
+
+        // Change the url and remove the encryptionKey to avoid detection.
+        val newUrl = request.url().newBuilder().removeAllQueryParameters("encryptionKey").build()
+        request = request.newBuilder().url(newUrl).build()
+
+        val response = it.proceed(request)
+
+        val image = decodeImage(encryptionKey, response.body()!!.bytes())
+
+        val body = ResponseBody.create(MediaType.parse("image/jpeg"), image)
+        response.newBuilder().body(body).build()
+    }.build()
+
+    override fun popularMangaRequest(page: Int): Request {
+        return GET("$baseUrl/title_list/ranking", catalogHeaders)
+    }
+
+    override fun popularMangaParse(response: Response): MangasPage {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            return MangasPage(emptyList(), false)
+
+        val mangas = result["success"]["titleRankingView"]["titles"].array.map {
+            SManga.create().apply {
+                title = it["name"].string
+                thumbnail_url = it["portraitImageUrl"].string
+                url = "#/titles/${it["titleId"].int}"
+            }
+        }
+
+        return MangasPage(mangas, false)
+    }
+
+    override fun latestUpdatesRequest(page: Int): Request {
+        return GET("$baseUrl/web/web_home?lang=eng", catalogHeaders)
+    }
+
+    override fun latestUpdatesParse(response: Response): MangasPage {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            return MangasPage(emptyList(), false)
+
+        val mangas = result["success"]["webHomeView"]["groups"].array
+                .flatMap { it["titles"].array }
+                .mapNotNull { it["title"].obj }
+                .map {
+                    SManga.create().apply {
+                        title = it["name"].string
+                        thumbnail_url = it["portraitImageUrl"].string
+                        url = "#/titles/${it["titleId"].int}"
+                    }
+                }
+
+        return MangasPage(mangas, false)
+    }
+
+    override fun fetchSearchManga(page: Int, query: String, filters: FilterList): Observable<MangasPage> {
+        return client.newCall(searchMangaRequest(page, query, filters))
+                .asObservableSuccess()
+                .map { searchMangaParse(it) }
+                .map { MangasPage(it.mangas.filter { m -> m.title.contains(query, true) }, it.hasNextPage) }
+    }
+
+    override fun searchMangaRequest(page: Int, query: String, filters: FilterList): Request {
+        return GET("$baseUrl/title_list/all", catalogHeaders)
+    }
+
+    override fun searchMangaParse(response: Response): MangasPage {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            return MangasPage(emptyList(), false)
+
+        val mangas = result["success"]["allTitlesView"]["titles"].array.map {
+            SManga.create().apply {
+                title = it["name"].string
+                thumbnail_url = it["portraitImageUrl"].string
+                url = "#/titles/${it["titleId"].int}"
+            }
+        }
+
+        return MangasPage(mangas, false)
+    }
+
+    private fun titleDetailsRequest(manga: SManga): Request {
+        val mangaId = manga.url.substringAfterLast("/")
+        return GET("$baseUrl/title_detail?title_id=$mangaId", catalogHeaders)
+    }
+
+    override fun mangaDetailsRequest(manga: SManga): Request = titleDetailsRequest(manga)
+
+    override fun mangaDetailsParse(response: Response): SManga {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            throw Exception("Some error happened when trying to obtain the title details.")
+
+        val details = result["success"]["titleDetailView"].obj
+        val title = details["title"].obj
+
+        return SManga.create().apply {
+            author = title["author"].string
+            artist = title["author"].string
+            description = details["overview"].string + "\n\n" + details["viewingPeriodDescription"].string
+            status = SManga.ONGOING
+        }
+    }
+
+    override fun chapterListRequest(manga: SManga): Request = titleDetailsRequest(manga)
+
+    override fun chapterListParse(response: Response): List<SChapter> {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            return emptyList()
+
+        val titleDetailView = result["success"]["titleDetailView"].obj
+
+        val chapters = titleDetailView["firstChapterList"].array +
+                (titleDetailView["lastChapterList"].nullArray ?: emptyList())
+
+        return chapters.reversed()
+                // If the subTitle is null, then the chapter time expired.
+                .filter { it.obj["subTitle"] != null }
+                .map {
+                    SChapter.create().apply {
+                        name = "${it["name"].string} - ${it["subTitle"].string}"
+                        scanlator = "Shueisha"
+                        date_upload = 1000L * it["startTimeStamp"].long
+                        url = "#/viewer/${it["chapterId"].int}"
+                        chapter_number = it["name"].string.substringAfter("#").toFloatOrNull() ?: 0f
+                    }
+                }
+    }
+
+    override fun pageListRequest(chapter: SChapter): Request {
+        val chapterId = chapter.url.substringAfterLast("/")
+        return GET("$baseUrl/manga_viewer?chapter_id=$chapterId&split=yes&img_quality=high", catalogHeaders)
+    }
+
+    override fun pageListParse(response: Response): List<Page> {
+        val result = response.asProto()
+
+        if (result["success"] == null)
+            return emptyList()
+
+        return result["success"]["mangaViewer"]["pages"].array
+                .mapNotNull { it["page"].obj }
+                .mapIndexed { i, page ->
+                    val encryptionKey = if (page["encryptionKey"] == null) "" else "&encryptionKey=${page["encryptionKey"].string}"
+                    Page(i, "", "${page["imageUrl"].string}$encryptionKey")
+                }
+    }
+
+    override fun fetchImageUrl(page: Page): Observable<String> {
+        return Observable.just(page.imageUrl!!)
+    }
+
+    override fun imageUrlParse(response: Response): String = ""
+
+    override fun imageRequest(page: Page): Request {
+        val newHeaders = Headers.Builder().apply {
+            add("Referer", WEB_URL)
+            add("User-Agent", USER_AGENT)
+        }.build()
+
+        return GET(page.imageUrl!!, newHeaders)
+    }
+
+    private fun decodeImage(encryptionKey: String, image: ByteArray): ByteArray {
+        val variablesSrc = """
+            var ENCRYPTION_KEY = "$encryptionKey";
+            var RESPONSE_BYTES = new Uint8Array([${image.joinToString()}]);
+            """
+
+        val res = Duktape.create().use {
+            it.evaluate(variablesSrc + IMAGE_DECRYPT_SRC) as String
+        }
+
+        return res.substringAfter("[").substringBefore("]")
+                .split(",")
+                .map { it.toInt().toByte() }
+                .toByteArray()
+    }
+
+    private fun Response.asProto(): JsonObject {
+        val bytes = body()!!.bytes()
+        val messageBytes = "var BYTE_ARR = new Uint8Array([${bytes.joinToString()}]);"
+
+        val res = Duktape.create().use {
+            it.set("helper", DuktapeHelper::class.java, object : DuktapeHelper {
+                override fun getProtobuf(): String = getProtobufJSLib()
+            })
+            it.evaluate(messageBytes + PROTOBUFJS_DECODE_SRC) as String
+        }
+
+        return JSON_PARSER.parse(res).obj
+    }
+
+    private fun getProtobufJSLib(): String {
+        if (PROTOBUFJS == null)
+            PROTOBUFJS = client.newCall(GET(PROTOBUFJS_CDN, headers))
+                    .execute().body()!!.string()
+        return checkNotNull(PROTOBUFJS)
+    }
+
+    private interface DuktapeHelper {
+        fun getProtobuf(): String
+    }
+
+    companion object {
+        private const val WEB_URL = "https://mangaplus.shueisha.co.jp"
+        private const val USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.92 Safari/537.36"
+        private val JSON_PARSER by lazy { JsonParser() }
+
+        private const val IMAGE_DECRYPT_SRC = """
+            function hex2bin(hex) {
+                return new Uint8Array(hex.match(/.{1,2}/g)
+                        .map(function (x) { return parseInt(x, 16) }));
+            }
+
+            function decode(encryptionKey, bytes) {
+                var keystream = hex2bin(encryptionKey);
+                var content = bytes;
+                var blockSizeInBytes = keystream.length;
+
+                for (var i = 0; i < content.length; i++) {
+                    content[i] ^= keystream[i % blockSizeInBytes];
+                }
+
+                return content;
+            }
+
+            (function() {
+                var decoded = decode(ENCRYPTION_KEY, RESPONSE_BYTES);
+                return JSON.stringify([].slice.call(decoded));
+            })();
+            """
+
+        private var PROTOBUFJS: String? = null
+        private const val PROTOBUFJS_CDN = "https://cdn.rawgit.com/dcodeIO/protobuf.js/6.8.8/dist/light/protobuf.min.js"
+
+        private const val PROTOBUFJS_DECODE_SRC = """
+            Duktape.modSearch = function(id) {
+                if (id == "protobufjs")
+                    return helper.getProtobuf();
+                throw new Error("Cannot find module: " + id);
+            }
+
+            var protobuf = require("protobufjs");
+
+            var Root = protobuf.Root;
+            var Type = protobuf.Type;
+            var Field = protobuf.Field;
+
+            var Response = new Type("Response")
+                  .add(new Field("success", 1, "SuccessResult"))
+                  .add(new Field("error", 2, "ErrorResult"));
+
+            var ErrorResult = new Type("ErrorResult")
+                  .add(new Field("action", 1, "int32"))
+                  .add(new Field("englishPopup", 2, "Popup"))
+                  .add(new Field("spanishPopup", 3, "Popup"));
+
+            var SuccessResult = new Type("SuccessResult")
+                  .add(new Field("allTitlesView", 5, "AllTitlesView"))
+                  .add(new Field("titleRankingView", 6, "TitleRankingView"))
+                  .add(new Field("titleDetailView", 8, "TitleDetailView"))
+                  .add(new Field("mangaViewer", 10, "MangaViewer"))
+                  .add(new Field("webHomeView", 11, "WebHomeView"));
+
+            var TitleRankingView = new Type("TitleRankingView")
+                  .add(new Field("titles", 1, "Title", "repeated"));
+
+            var AllTitlesView = new Type("AllTitlesView")
+                  .add(new Field("titles", 1, "Title", "repeated"));
+
+            var WebHomeView = new Type("WebHomeView")
+                  .add(new Field("groups", 2, "UpdatedTitleGroup", "repeated"));
+
+            var TitleDetailView = new Type("TitleDetailView")
+                  .add(new Field("title", 1, "Title"))
+                  .add(new Field("overview", 3, "string"))
+                  .add(new Field("viewingPeriodDescription", 7, "string"))
+                  .add(new Field("firstChapterList", 9, "Chapter", "repeated"))
+                  .add(new Field("lastChapterList", 10, "Chapter", "repeated"))
+                  .add(new Field("chaptersDescending", 17, "bool"));
+
+            var MangaViewer = new Type("MangaViewer")
+                  .add(new Field("pages", 1, "Page", "repeated"));
+
+            var Title = new Type("Title")
+                  .add(new Field("titleId", 1, "uint32"))
+                  .add(new Field("name", 2, "string"))
+                  .add(new Field("author", 3, "string"))
+                  .add(new Field("portraitImageUrl", 4, "string"))
+                  .add(new Field("language", 7, "int32"));
+
+            var UpdatedTitleGroup = new Type("UpdatedTitleGroup")
+                  .add(new Field("groupName", 1, "string"))
+                  .add(new Field("titles", 2, "UpdatedTitle", "repeated"));
+
+            var UpdatedTitle = new Type("UpdatedTitle")
+                  .add(new Field("title", 1, "Title"))
+                  .add(new Field("chapterId", 2, "uint32"))
+                  .add(new Field("chapterName", 3, "string"))
+                  .add(new Field("chapterSubtitle", 4, "string"));
+
+            var Chapter = new Type("Chapter")
+                  .add(new Field("titleId", 1, "uint32"))
+                  .add(new Field("chapterId", 2, "uint32"))
+                  .add(new Field("name", 3, "string"))
+                  .add(new Field("subTitle", 4, "string", "optional"))
+                  .add(new Field("startTimeStamp", 6, "uint32"))
+                  .add(new Field("endTimeStamp", 7, "uint32"));
+
+            var Page = new Type("Page")
+                  .add(new Field("page", 1, "MangaPage"));
+
+            var MangaPage = new Type("MangaPage")
+                  .add(new Field("imageUrl", 1, "string"))
+                  .add(new Field("width", 2, "uint32"))
+                  .add(new Field("height", 3, "uint32"))
+                  .add(new Field("encryptionKey", 5, "string", "optional"));
+
+            var root = new Root()
+                  .define("mangaplus")
+                  .add(Response)
+                  .add(ErrorResult)
+                  .add(SuccessResult)
+                  .add(TitleRankingView)
+                  .add(AllTitlesView)
+                  .add(WebHomeView)
+                  .add(TitleDetailView)
+                  .add(MangaViewer)
+                  .add(Title)
+                  .add(UpdatedTitleGroup)
+                  .add(UpdatedTitle)
+                  .add(Chapter)
+                  .add(Page)
+                  .add(MangaPage);
+
+            function decode(arr) {
+                var Response = root.lookupType("Response");
+                var message = Response.decode(arr);
+                return Response.toObject(message);
+            }
+
+            (function () {
+                return JSON.stringify(decode(BYTE_ARR)).replace(/\,\{\}/g, "");
+            })();
+            """
+    }
+}