diff --git a/package.json b/package.json
index 081780250..7b81c925b 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,6 @@
 		"dompurify": "1.0.5",
 		"double-ended-queue": "2.1.0-0",
 		"elasticsearch": "15.1.1",
-		"element-ui": "2.4.6",
 		"emojilib": "2.3.0",
 		"escape-regexp": "0.0.1",
 		"eslint": "5.0.1",
@@ -132,7 +131,6 @@
 		"insert-text-at-cursor": "0.1.1",
 		"is-root": "2.0.0",
 		"is-url": "1.2.4",
-		"jquery": "3.3.1",
 		"js-yaml": "3.12.0",
 		"jsdom": "11.12.0",
 		"koa": "2.5.1",
@@ -160,8 +158,6 @@
 		"ms": "2.1.1",
 		"nan": "2.11.0",
 		"nested-property": "0.0.7",
-		"node-sass": "4.9.3",
-		"node-sass-json-importer": "4.0.1",
 		"nprogress": "0.2.0",
 		"object-assign-deep": "0.4.0",
 		"on-build-webpack": "0.1.0",
diff --git a/src/client/app/common/views/components/games/reversi/reversi.game.vue b/src/client/app/common/views/components/games/reversi/reversi.game.vue
index 673879a43..fea19d917 100644
--- a/src/client/app/common/views/components/games/reversi/reversi.game.vue
+++ b/src/client/app/common/views/components/games/reversi/reversi.game.vue
@@ -50,15 +50,15 @@
 	</div>
 
 	<div class="player" v-if="game.isEnded">
-		<el-button-group>
-			<el-button type="primary" @click="logPos = 0" :disabled="logPos == 0">%fa:angle-double-left%</el-button>
-			<el-button type="primary" @click="logPos--" :disabled="logPos == 0">%fa:angle-left%</el-button>
-		</el-button-group>
+		<div>
+			<button @click="logPos = 0" :disabled="logPos == 0">%fa:angle-double-left%</button>
+			<button @click="logPos--" :disabled="logPos == 0">%fa:angle-left%</button>
+		</div>
 		<span>{{ logPos }} / {{ logs.length }}</span>
-		<el-button-group>
-			<el-button type="primary" @click="logPos++" :disabled="logPos == logs.length">%fa:angle-right%</el-button>
-			<el-button type="primary" @click="logPos = logs.length" :disabled="logPos == logs.length">%fa:angle-double-right%</el-button>
-		</el-button-group>
+		<div>
+			<button @click="logPos++" :disabled="logPos == logs.length">%fa:angle-right%</button>
+			<button @click="logPos = logs.length" :disabled="logPos == logs.length">%fa:angle-double-right%</button>
+		</div>
 	</div>
 
 	<div class="info">
diff --git a/src/client/app/common/views/components/games/reversi/reversi.index.vue b/src/client/app/common/views/components/games/reversi/reversi.index.vue
index fa88aeaaf..d23902aae 100644
--- a/src/client/app/common/views/components/games/reversi/reversi.index.vue
+++ b/src/client/app/common/views/components/games/reversi/reversi.index.vue
@@ -3,7 +3,6 @@
 	<h1>%i18n:@title%</h1>
 	<p>%i18n:@sub-title%</p>
 	<div class="play">
-		<!--<el-button round>フリーマッチ(準備中)</el-button>-->
 		<form-button primary round @click="match">%i18n:@invite%</form-button>
 		<details>
 			<summary>%i18n:@rule%</summary>
diff --git a/src/client/app/common/views/components/games/reversi/reversi.room.vue b/src/client/app/common/views/components/games/reversi/reversi.room.vue
index aed8718dd..fef833d63 100644
--- a/src/client/app/common/views/components/games/reversi/reversi.room.vue
+++ b/src/client/app/common/views/components/games/reversi/reversi.room.vue
@@ -59,11 +59,6 @@
 			</header>
 
 			<div>
-				<el-alert v-for="message in messages"
-						:title="message.text"
-						:type="message.type"
-						:key="message.id"/>
-
 				<template v-for="item in form">
 					<mk-switch v-if="item.type == 'switch'" v-model="item.value" :key="item.id" :text="item.label" @change="onChangeForm(item)">{{ item.desc || '' }}</mk-switch>
 
@@ -93,7 +88,7 @@
 						</header>
 
 						<div>
-							<el-input v-model="item.value" @change="onChangeForm(item)"/>
+							<input v-model="item.value" @change="onChangeForm(item)"/>
 						</div>
 					</div>
 				</template>
diff --git a/src/client/app/desktop/script.ts b/src/client/app/desktop/script.ts
index f0e8a4266..e32682286 100644
--- a/src/client/app/desktop/script.ts
+++ b/src/client/app/desktop/script.ts
@@ -6,7 +6,6 @@ import VueRouter from 'vue-router';
 
 // Style
 import './style.styl';
-import '../../element.scss';
 
 import init from '../init';
 import fuckAdBlock from '../common/scripts/fuck-ad-block';
diff --git a/src/client/app/desktop/views/components/settings.drive.vue b/src/client/app/desktop/views/components/settings.drive.vue
index e8a3cc968..d254b2711 100644
--- a/src/client/app/desktop/views/components/settings.drive.vue
+++ b/src/client/app/desktop/views/components/settings.drive.vue
@@ -1,7 +1,6 @@
 <template>
 <div class="root">
 	<template v-if="!fetching">
-		<el-progress :text-inside="true" :stroke-width="18" :percentage="Math.floor((usage / capacity) * 100)"/>
 		<p><b>{{ capacity | bytes }}</b>%i18n:max%<b>{{ usage | bytes }}</b>%i18n:in-use%</p>
 	</template>
 </div>
diff --git a/src/client/app/desktop/views/components/settings.profile.vue b/src/client/app/desktop/views/components/settings.profile.vue
index 0f53941b3..d47b5b224 100644
--- a/src/client/app/desktop/views/components/settings.profile.vue
+++ b/src/client/app/desktop/views/components/settings.profile.vue
@@ -19,7 +19,7 @@
 	</label>
 	<label class="ui from group">
 		<p>%i18n:@birthday%</p>
-		<el-date-picker v-model="birthday" type="date" value-format="yyyy-MM-dd"/>
+		<input type="date" v-model="birthday"/>
 	</label>
 	<button class="ui primary" @click="save">%i18n:@save%</button>
 	<section>
diff --git a/src/client/app/desktop/views/components/settings.vue b/src/client/app/desktop/views/components/settings.vue
index 1973acc83..709715e59 100644
--- a/src/client/app/desktop/views/components/settings.vue
+++ b/src/client/app/desktop/views/components/settings.vue
@@ -87,13 +87,11 @@
 				<span>%i18n:@enable-sounds-desc%</span>
 			</mk-switch>
 			<label>%i18n:@volume%</label>
-			<el-slider
+			<input type="range"
 				v-model="soundVolume"
-				:show-input="true"
-				:format-tooltip="v => `${v * 100}%`"
 				:disabled="!enableSounds"
-				:max="1"
-				:step="0.1"
+				max="1"
+				step="0.1"
 			/>
 			<button class="ui button" @click="soundTest">%fa:volume-up% %i18n:@test%</button>
 		</section>
@@ -105,14 +103,15 @@
 
 		<section class="web" v-show="page == 'web'">
 			<h1>%i18n:@language%</h1>
-			<el-select v-model="lang" placeholder="%i18n:@pick-language%">
-				<el-option-group label="%i18n:@recommended%">
-					<el-option label="%i18n:@auto%" :value="null"/>
-				</el-option-group>
-				<el-option-group label="%i18n:@specify-language%">
-					<el-option v-for="x in langs" :label="x[1]" :value="x[0]" :key="x[0]"/>
-				</el-option-group>
-			</el-select>
+			<select v-model="lang" placeholder="%i18n:@pick-language%">
+				<optgroup label="%i18n:@recommended%">
+					<option value="">%i18n:@auto%</option>
+				</optgroup>
+
+				<optgroup label="%i18n:@specify-language%">
+					<option v-for="x in langs" :value="x[0]" :key="x[0]">{{ x[1] }}</option>
+				</optgroup>
+			</select>
 			<div class="none ui info">
 				<p>%fa:info-circle%%i18n:@language-desc%</p>
 			</div>
@@ -207,10 +206,6 @@
 			<mk-switch v-model="enableExperimentalFeatures" text="%i18n:@experimental%">
 				<span>%i18n:@experimental-desc%</span>
 			</mk-switch>
-			<details v-if="debug">
-				<summary>%i18n:@tools%</summary>
-				<button class="ui button block" @click="taskmngr">%i18n:@task-manager%</button>
-			</details>
 		</section>
 	</div>
 </div>
@@ -228,7 +223,6 @@ import XSignins from './settings.signins.vue';
 import XDrive from './settings.drive.vue';
 import { url, langs, version } from '../../../config';
 import checkForUpdate from '../../../common/scripts/check-for-update';
-import MkTaskManager from './taskmanager.vue';
 
 export default Vue.extend({
 	components: {
@@ -408,9 +402,6 @@ export default Vue.extend({
 		});
 	},
 	methods: {
-		taskmngr() {
-			(this as any).os.new(MkTaskManager);
-		},
 		customizeHome() {
 			this.$router.push('/i/customize-home');
 			this.$emit('done');
diff --git a/src/client/app/desktop/views/components/taskmanager.vue b/src/client/app/desktop/views/components/taskmanager.vue
deleted file mode 100644
index 1f1385add..000000000
--- a/src/client/app/desktop/views/components/taskmanager.vue
+++ /dev/null
@@ -1,219 +0,0 @@
-<template>
-<mk-window ref="window" width="750px" height="500px" @closed="$destroy" name="TaskManager">
-	<span slot="header" :class="$style.header">%fa:stethoscope%%i18n:@title%</span>
-	<el-tabs :class="$style.content">
-		<el-tab-pane label="Requests">
-			<el-table
-				:data="os.requests"
-				style="width: 100%"
-				:default-sort="{prop: 'date', order: 'descending'}"
-			>
-				<el-table-column type="expand">
-					<template slot-scope="props">
-						<pre>{{ props.row.data }}</pre>
-						<pre>{{ props.row.res }}</pre>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="Requested at"
-					prop="date"
-					sortable
-				>
-					<template slot-scope="scope">
-						<b style="margin-right: 8px">{{ scope.row.date.getTime() }}</b>
-						<span>(<mk-time :time="scope.row.date"/>)</span>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="Name"
-				>
-					<template slot-scope="scope">
-						<b>{{ scope.row.name }}</b>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="Status"
-				>
-					<template slot-scope="scope">
-						<span>{{ scope.row.status || '(pending)' }}</span>
-					</template>
-				</el-table-column>
-			</el-table>
-		</el-tab-pane>
-
-		<el-tab-pane label="Streams">
-			<el-table
-				:data="os.connections"
-				style="width: 100%"
-			>
-				<el-table-column
-					label="Uptime"
-				>
-					<template slot-scope="scope">
-						<mk-timer v-if="scope.row.connectedAt" :time="scope.row.connectedAt"/>
-						<span v-else>-</span>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="Name"
-				>
-					<template slot-scope="scope">
-						<b>{{ scope.row.name == '' ? '[Home]' : scope.row.name }}</b>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="User"
-				>
-					<template slot-scope="scope">
-						<span>{{ scope.row.user || '(anonymous)' }}</span>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					prop="state"
-					label="State"
-				/>
-
-				<el-table-column
-					prop="in"
-					label="In"
-				/>
-
-				<el-table-column
-					prop="out"
-					label="Out"
-				/>
-			</el-table>
-		</el-tab-pane>
-
-		<el-tab-pane label="Streams (Inspect)">
-			<el-tabs type="card" style="height:50%">
-				<el-tab-pane v-for="c in os.connections" :label="c.name == '' ? '[Home]' : c.name" :key="c.id" :name="c.id" ref="connectionsTab">
-					<div style="padding: 12px 0 0 12px">
-					<el-button size="mini" @click="send(c)">Send</el-button>
-					<el-button size="mini" type="warning" @click="c.isSuspended = true" v-if="!c.isSuspended">Suspend</el-button>
-					<el-button size="mini" type="success" @click="c.isSuspended = false" v-else>Resume</el-button>
-					<el-button size="mini" type="danger" @click="c.close">Disconnect</el-button>
-				</div>
-
-					<el-table
-						:data="c.inout"
-						style="width: 100%"
-						:default-sort="{prop: 'at', order: 'descending'}"
-					>
-						<el-table-column type="expand">
-							<template slot-scope="props">
-								<pre>{{ props.row.data }}</pre>
-							</template>
-						</el-table-column>
-
-						<el-table-column
-							label="Date"
-							prop="at"
-							sortable
-						>
-							<template slot-scope="scope">
-								<b style="margin-right: 8px">{{ scope.row.at.getTime() }}</b>
-								<span>(<mk-time :time="scope.row.at"/>)</span>
-							</template>
-						</el-table-column>
-
-						<el-table-column
-							label="Type"
-						>
-							<template slot-scope="scope">
-								<span>{{ getMessageType(scope.row.data) }}</span>
-							</template>
-						</el-table-column>
-
-						<el-table-column
-							label="Incoming / Outgoing"
-							prop="type"
-						/>
-					</el-table>
-				</el-tab-pane>
-			</el-tabs>
-		</el-tab-pane>
-
-		<el-tab-pane label="Windows">
-			<el-table
-				:data="Array.from(os.windows.windows)"
-				style="width: 100%"
-			>
-				<el-table-column
-					label="Name"
-				>
-					<template slot-scope="scope">
-						<b>{{ scope.row.name || '(unknown)' }}</b>
-					</template>
-				</el-table-column>
-
-				<el-table-column
-					label="Operations"
-				>
-					<template slot-scope="scope">
-						<el-button size="mini" type="danger" @click="scope.row.close">Close</el-button>
-					</template>
-				</el-table-column>
-			</el-table>
-		</el-tab-pane>
-	</el-tabs>
-</mk-window>
-</template>
-
-<script lang="ts">
-import Vue from 'vue';
-
-export default Vue.extend({
-	mounted() {
-		(this as any).os.windows.on('added', this.onWindowsChanged);
-		(this as any).os.windows.on('removed', this.onWindowsChanged);
-	},
-	beforeDestroy() {
-		(this as any).os.windows.off('added', this.onWindowsChanged);
-		(this as any).os.windows.off('removed', this.onWindowsChanged);
-	},
-	methods: {
-		getMessageType(data): string {
-			return data.type ? data.type : '-';
-		},
-		onWindowsChanged() {
-			this.$forceUpdate();
-		},
-		send(c) {
-			(this as any).apis.input({
-				title: 'Send a JSON message',
-				allowEmpty: false
-			}).then(json => {
-				c.send(JSON.parse(json));
-			});
-		}
-	}
-});
-</script>
-
-<style lang="stylus" module>
-.header
-	> [data-fa]
-		margin-right 4px
-
-.content
-	height 100%
-	overflow auto
-
-</style>
-
-<style>
-.el-tabs__header {
-	margin-bottom: 0 !important;
-}
-
-.el-tabs__item {
-	padding: 0 20px !important;
-}
-</style>
diff --git a/src/client/app/init.ts b/src/client/app/init.ts
index 82924e92e..dfc3a819b 100644
--- a/src/client/app/init.ts
+++ b/src/client/app/init.ts
@@ -7,9 +7,6 @@ import Vuex from 'vuex';
 import VueRouter from 'vue-router';
 import * as TreeView from 'vue-json-tree-view';
 import VAnimateCss from 'v-animate-css';
-import Element from 'element-ui';
-import ElementLocaleEn from 'element-ui/lib/locale/lang/en';
-import ElementLocaleJa from 'element-ui/lib/locale/lang/ja';
 import VModal from 'vue-js-modal';
 
 import App from './app.vue';
@@ -17,18 +14,10 @@ import checkForUpdate from './common/scripts/check-for-update';
 import MiOS, { API } from './mios';
 import { version, codename, lang } from './config';
 
-let elementLocale;
-switch (lang) {
-	case 'ja-JP': elementLocale = ElementLocaleJa; break;
-	case 'en-US': elementLocale = ElementLocaleEn; break;
-	default: elementLocale = ElementLocaleEn; break;
-}
-
 Vue.use(Vuex);
 Vue.use(VueRouter);
 Vue.use(TreeView);
 Vue.use(VAnimateCss);
-Vue.use(Element, { locale: elementLocale });
 Vue.use(VModal);
 
 // Register global directives
diff --git a/src/client/app/mobile/script.ts b/src/client/app/mobile/script.ts
index 5b9d45462..9412c8598 100644
--- a/src/client/app/mobile/script.ts
+++ b/src/client/app/mobile/script.ts
@@ -6,7 +6,6 @@ import VueRouter from 'vue-router';
 
 // Style
 import './style.styl';
-import '../../element.scss';
 
 import init from '../init';
 
diff --git a/src/client/element.scss b/src/client/element.scss
deleted file mode 100644
index 917198e02..000000000
--- a/src/client/element.scss
+++ /dev/null
@@ -1,12 +0,0 @@
-/* Element variable definitons */
-/* SEE: http://element.eleme.io/#/en-US/component/custom-theme */
-
-@import '../const.json';
-
-/* theme color */
-$--color-primary: $themeColor;
-
-/* icon font path, required */
-$--font-path: '~element-ui/lib/theme-chalk/fonts';
-
-@import "~element-ui/packages/theme-chalk/src/index";
diff --git a/webpack.config.ts b/webpack.config.ts
index a50d6c40c..325923084 100644
--- a/webpack.config.ts
+++ b/webpack.config.ts
@@ -7,7 +7,6 @@ import * as webpack from 'webpack';
 import chalk from 'chalk';
 import rndstr from 'rndstr';
 const { VueLoaderPlugin } = require('vue-loader');
-const jsonImporter = require('node-sass-json-importer');
 const minifyHtml = require('html-minifier').minify;
 const WebpackOnBuildPlugin = require('on-build-webpack');
 //const HardSourceWebpackPlugin = require('hard-source-webpack-plugin');
@@ -183,22 +182,6 @@ module.exports = {
 					loader: 'stylus-loader'
 				}]
 			}]
-		}, {
-			test: /\.scss$/,
-			exclude: /node_modules/,
-			use: [{
-				loader: 'style-loader'
-			}, {
-				loader: 'css-loader',
-				options: {
-					minimize: true
-				}
-			}, {
-				loader: 'sass-loader',
-				options: {
-					importer: jsonImporter(),
-				}
-			}]
 		}, {
 			test: /\.css$/,
 			use: [{