diff --git a/app/Http/Controllers/Api/CardController.php b/app/Http/Controllers/Api/CardController.php
index 87eb52d..e5578d2 100644
--- a/app/Http/Controllers/Api/CardController.php
+++ b/app/Http/Controllers/Api/CardController.php
@@ -4,6 +4,7 @@ namespace App\Http\Controllers\Api;
 
 use App\Metadata;
 use App\MetadataResolver\MetadataResolver;
+use App\Tag;
 use App\Utilities\Formatter;
 use Illuminate\Http\Request;
 
@@ -41,6 +42,13 @@ class CardController
                 'image' => $resolved->image,
                 'expires_at' => $resolved->expires_at
             ]);
+
+            $tagIds = [];
+            foreach ($resolved->tags as $tagName) {
+                $tag = Tag::firstOrCreate(['name' => $tagName]);
+                $tagIds[] = $tag->id;
+            }
+            $metadata->tags()->sync($tagIds);
         }
 
         $response = response($metadata);
diff --git a/app/Listeners/LinkCollector.php b/app/Listeners/LinkCollector.php
index 0354f65..1ca8682 100644
--- a/app/Listeners/LinkCollector.php
+++ b/app/Listeners/LinkCollector.php
@@ -5,6 +5,7 @@ namespace App\Listeners;
 use App\Events\LinkDiscovered;
 use App\Metadata;
 use App\MetadataResolver\MetadataResolver;
+use App\Tag;
 use App\Utilities\Formatter;
 use GuzzleHttp\Exception\TransferException;
 use Illuminate\Contracts\Queue\ShouldQueue;
@@ -47,12 +48,19 @@ class LinkCollector
         if ($metadata == null || ($metadata->expires_at !== null && $metadata->expires_at < now())) {
             try {
                 $resolved = $this->metadataResolver->resolve($url);
-                Metadata::updateOrCreate(['url' => $url], [
+                $metadata = Metadata::updateOrCreate(['url' => $url], [
                     'title' => $resolved->title,
                     'description' => $resolved->description,
                     'image' => $resolved->image,
                     'expires_at' => $resolved->expires_at
                 ]);
+
+                $tagIds = [];
+                foreach ($resolved->tags as $tagName) {
+                    $tag = Tag::firstOrCreate(['name' => $tagName]);
+                    $tagIds[] = $tag->id;
+                }
+                $metadata->tags()->sync($tagIds);
             } catch (TransferException $e) {
                 // 何らかの通信エラーによってメタデータの取得に失敗した時、とりあえずエラーログにURLを残す
                 Log::error(self::class . ': メタデータの取得に失敗 URL=' . $url);
diff --git a/app/Metadata.php b/app/Metadata.php
index dc44009..d516b0b 100644
--- a/app/Metadata.php
+++ b/app/Metadata.php
@@ -14,4 +14,9 @@ class Metadata extends Model
     protected $visible = ['url', 'title', 'description', 'image', 'expires_at'];
 
     protected $dates = ['created_at', 'updated_at', 'expires_at'];
+
+    public function tags()
+    {
+        return $this->belongsToMany(Tag::class)->withTimestamps();
+    }
 }
diff --git a/app/MetadataResolver/KomifloResolver.php b/app/MetadataResolver/KomifloResolver.php
index c906548..7073015 100644
--- a/app/MetadataResolver/KomifloResolver.php
+++ b/app/MetadataResolver/KomifloResolver.php
@@ -34,6 +34,20 @@ class KomifloResolver implements Resolver
                 ($json['content']['parents'][0]['data']['title'] ?? '?');
             $metadata->image = 'https://t.komiflo.com/564_mobile_large_3x/' . $json['content']['named_imgs']['cover']['filename'];
 
+            // 作者情報
+            if (!empty($json['content']['attributes']['artists']['children'])) {
+                foreach ($json['content']['attributes']['artists']['children'] as $artist) {
+                    $metadata->tags[] = preg_replace('/\s/', '_', $artist['data']['name']);
+                }
+            }
+
+            // タグ
+            if (!empty($json['content']['attributes']['tags']['children'])) {
+                foreach ($json['content']['attributes']['tags']['children'] as $tag) {
+                    $metadata->tags[] = preg_replace('/\s/', '_', $tag['data']['name']);
+                }
+            }
+
             return $metadata;
         } else {
             throw new \RuntimeException("{$res->getStatusCode()}: $url");
diff --git a/app/MetadataResolver/Metadata.php b/app/MetadataResolver/Metadata.php
index dbe8654..62d16e8 100644
--- a/app/MetadataResolver/Metadata.php
+++ b/app/MetadataResolver/Metadata.php
@@ -6,9 +6,21 @@ use Carbon\Carbon;
 
 class Metadata
 {
+    /** @var string タイトル */
     public $title = '';
+
+    /** @var string 概要 */
     public $description = '';
+
+    /** @var string サムネイルのURL */
     public $image = '';
-    /** @var Carbon|null */
+
+    /** @var Carbon|null メタデータの有効期限 */
     public $expires_at = null;
+
+    /**
+     * @var string[] タグ
+     * チェックインタグと同様に保存されるため、スペースや改行文字を含めてはいけません。
+     */
+    public $tags = [];
 }
diff --git a/app/MetadataResolver/MetadataResolver.php b/app/MetadataResolver/MetadataResolver.php
index 565e05f..129899a 100644
--- a/app/MetadataResolver/MetadataResolver.php
+++ b/app/MetadataResolver/MetadataResolver.php
@@ -15,7 +15,7 @@ class MetadataResolver implements Resolver
         '~www\.melonbooks\.co\.jp/detail/detail\.php~' => MelonbooksResolver::class,
         '~ec\.toranoana\.(jp|shop)/(tora|joshi)(_[rd]+)?/(ec|digi)/item/~' => ToranoanaResolver::class,
         '~iwara\.tv/videos/.*~' => IwaraResolver::class,
-        '~www\.dlsite\.com/.*/work/=/product_id/..\d+\.html~' => DLsiteResolver::class,
+        '~www\.dlsite\.com/.*/work/=/product_id/..\d+(\.html)?~' => DLsiteResolver::class,
         '~dlsite\.jp/mawtw/..\d+~' => DLsiteResolver::class,
         '~www\.pixiv\.net/member_illust\.php\?illust_id=\d+~' => PixivResolver::class,
         '~fantia\.jp/posts/\d+~' => FantiaResolver::class,
diff --git a/app/MetadataResolver/PixivResolver.php b/app/MetadataResolver/PixivResolver.php
index b42092b..69c9937 100644
--- a/app/MetadataResolver/PixivResolver.php
+++ b/app/MetadataResolver/PixivResolver.php
@@ -49,6 +49,43 @@ class PixivResolver implements Resolver
         return str_replace('i.pximg.net', 'i.pixiv.cat', $pixivUrl);
     }
 
+    /**
+     * HTMLからタグとして利用可能な情報を抽出する
+     * @param string $html ページ HTML
+     * @return string[] タグ
+     */
+    public function extractTags(string $html): array
+    {
+        $dom = new \DOMDocument();
+        @$dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8'));
+        $xpath = new \DOMXPath($dom);
+
+        $nodes = $xpath->query("//meta[@name='keywords']");
+        if ($nodes->length === 0) {
+            return [];
+        }
+
+        $keywords = $nodes->item(0)->getAttribute('content');
+        $tags = [];
+
+        foreach (mb_split(',', $keywords) as $keyword) {
+            $keyword = trim($keyword);
+
+            if (empty($keyword)) {
+                continue;
+            }
+
+            // 一部の固定キーワードは無視
+            if (array_search($keyword, ['R-18', 'イラスト', 'pixiv', 'ピクシブ'], true)) {
+                continue;
+            }
+
+            $tags[] = preg_replace('/\s/', '_', $keyword);
+        }
+
+        return $tags;
+    }
+
     public function resolve(string $url): Metadata
     {
         parse_str(parse_url($url, PHP_URL_QUERY), $params);
@@ -78,6 +115,8 @@ class PixivResolver implements Resolver
 
             $metadata->image = $this->proxize($illustUrl);
 
+            $metadata->tags = $this->extractTags($res->getBody());
+
             return $metadata;
         } else {
             throw new \RuntimeException("{$res->getStatusCode()}: $url");
diff --git a/database/migrations/2019_04_29_111019_create_metadata_tag_table.php b/database/migrations/2019_04_29_111019_create_metadata_tag_table.php
new file mode 100644
index 0000000..fdef664
--- /dev/null
+++ b/database/migrations/2019_04_29_111019_create_metadata_tag_table.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateMetadataTagTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('metadata_tag', function (Blueprint $table) {
+            $table->increments('id');
+            $table->text('metadata_url')->index();
+            $table->integer('tag_id')->index();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('metadata_tag');
+    }
+}
diff --git a/resources/assets/js/checkin.js b/resources/assets/js/checkin.js
index bd06bfa..e68fc0c 100644
--- a/resources/assets/js/checkin.js
+++ b/resources/assets/js/checkin.js
@@ -33,9 +33,11 @@ $('#tagInput').on('keydown', function (ev) {
             case 'Tab':
             case 'Enter':
             case ' ':
-                insertTag($this.val().trim());
-                $this.val('');
-                updateTags();
+                if (ev.originalEvent.isComposing !== true) {
+                    insertTag($this.val().trim());
+                    $this.val('');
+                    updateTags();
+                }
                 ev.preventDefault();
                 break;
         }
diff --git a/yarn.lock b/yarn.lock
index 548e116..9629d93 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4157,9 +4157,9 @@ isobject@^3.0.0, isobject@^3.0.1:
   integrity sha1-TkMekrEalzFjaqH5yNHMvP2reN8=
 
 jquery@^3.2.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.3.1.tgz#958ce29e81c9790f31be7792df5d4d95fc57fbca"
-  integrity sha512-Ubldcmxp5np52/ENotGxlLe6aGMvmF4R8S6tZjsP6Knsaxd/xp3Zrh50cG93lR6nPXyUFwzN3ZSOQI0wRJNdGg==
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.4.1.tgz#714f1f8d9dde4bdfa55764ba37ef214630d80ef2"
+  integrity sha512-36+AdBzCL+y6qjw5Tx7HgzeGCzC81MDDgaUP8ld2zhx58HdqXGoBd+tHdrBMiyjGQs0Hxs/MLZTu/eHNJJuWPw==
 
 js-cookie@^2.2.0:
   version "2.2.0"