diff --git a/app/Events/LinkDiscovered.php b/app/Events/LinkDiscovered.php
new file mode 100644
index 0000000..0163dc6
--- /dev/null
+++ b/app/Events/LinkDiscovered.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Events;
+
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Foundation\Events\Dispatchable;
+use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
+
+class LinkDiscovered
+{
+    use Dispatchable, SerializesModels;
+
+    public $url;
+
+    /**
+     * Create a new event instance.
+     *
+     * @param string $url
+     */
+    public function __construct(string $url)
+    {
+        $this->url = $url;
+    }
+}
diff --git a/app/Http/Controllers/EjaculationController.php b/app/Http/Controllers/EjaculationController.php
index 1509443..43b3d13 100644
--- a/app/Http/Controllers/EjaculationController.php
+++ b/app/Http/Controllers/EjaculationController.php
@@ -2,6 +2,7 @@
 
 namespace App\Http\Controllers;
 
+use App\Events\LinkDiscovered;
 use App\Tag;
 use App\User;
 use Carbon\Carbon;
@@ -71,6 +72,10 @@ class EjaculationController extends Controller
         }
         $ejaculation->tags()->sync($tagIds);
 
+        if (!empty($ejaculation->link)) {
+            event(new LinkDiscovered($ejaculation->link));
+        }
+
         return redirect()->route('checkin.show', ['id' => $ejaculation->id])->with('status', 'チェックインしました！');
     }
 
@@ -148,6 +153,10 @@ class EjaculationController extends Controller
         }
         $ejaculation->tags()->sync($tagIds);
 
+        if (!empty($ejaculation->link)) {
+            event(new LinkDiscovered($ejaculation->link));
+        }
+
         return redirect()->route('checkin.show', ['id' => $ejaculation->id])->with('status', 'チェックインを修正しました！');
     }
 
diff --git a/app/Listeners/LinkCollector.php b/app/Listeners/LinkCollector.php
new file mode 100644
index 0000000..6bd41ad
--- /dev/null
+++ b/app/Listeners/LinkCollector.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace App\Listeners;
+
+use App\Events\LinkDiscovered;
+use App\Metadata;
+use App\MetadataResolver\MetadataResolver;
+use App\Utilities\Formatter;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+class LinkCollector
+{
+    /** @var Formatter */
+    private $formatter;
+    /** @var MetadataResolver */
+    private $metadataResolver;
+
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct(Formatter $formatter, MetadataResolver $metadataResolver)
+    {
+        $this->formatter = $formatter;
+        $this->metadataResolver = $metadataResolver;
+    }
+
+    /**
+     * Handle the event.
+     *
+     * @param  LinkDiscovered  $event
+     * @return void
+     */
+    public function handle(LinkDiscovered $event)
+    {
+        // URLの正規化
+        $url = $this->formatter->normalizeUrl($event->url);
+
+        // 無かったら取得
+        // TODO: ある程度古かったら再取得とかありだと思う
+        $metadata = Metadata::find($url);
+        if ($metadata == null) {
+            $resolved = $this->metadataResolver->resolve($url);
+            Metadata::create([
+                'url' => $url,
+                'title' => $resolved->title,
+                'description' => $resolved->description,
+                'image' => $resolved->image
+            ]);
+        }
+    }
+}
diff --git a/app/Metadata.php b/app/Metadata.php
new file mode 100644
index 0000000..98badb6
--- /dev/null
+++ b/app/Metadata.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Metadata extends Model
+{
+    public $incrementing = false;
+    protected $primaryKey = 'url';
+    protected $keyType = 'string';
+
+    protected $fillable = ['url', 'title', 'description', 'image'];
+    protected $visible = ['url', 'title', 'description', 'image'];
+}
diff --git a/app/Providers/EventServiceProvider.php b/app/Providers/EventServiceProvider.php
index fca6152..4e1b51e 100644
--- a/app/Providers/EventServiceProvider.php
+++ b/app/Providers/EventServiceProvider.php
@@ -13,9 +13,9 @@ class EventServiceProvider extends ServiceProvider
      * @var array
      */
     protected $listen = [
-        'App\Events\Event' => [
-            'App\Listeners\EventListener',
-        ],
+        'App\Events\LinkDiscovered' => [
+            'App\Listeners\LinkCollector'
+        ]
     ];
 
     /**
diff --git a/app/Utilities/Formatter.php b/app/Utilities/Formatter.php
index fd7da98..c19e6f2 100644
--- a/app/Utilities/Formatter.php
+++ b/app/Utilities/Formatter.php
@@ -36,4 +36,29 @@ class Formatter
     {
         return $this->linkify->processUrls($text);
     }
+
+    /**
+     * URLを正規化します。
+     * @param string $url URL
+     * @return string 正規化されたURL
+     */
+    public function normalizeUrl($url)
+    {
+        // Decode
+        $url = urldecode($url);
+
+        // Remove Hashbang
+        $url = preg_replace('~/#!/~u', '/', $url);
+
+        // Sort query parameters
+        $query = parse_url($url, PHP_URL_QUERY);
+        if (!empty($query)) {
+            $url = str_replace_last('?' . $query, '', $url);
+            parse_str($query, $params);
+            ksort($params);
+            $url = $url . '?' . http_build_query($params);
+        }
+
+        return $url;
+    }
 }
\ No newline at end of file
diff --git a/database/migrations/2018_06_07_225520_create_metadata_table.php b/database/migrations/2018_06_07_225520_create_metadata_table.php
new file mode 100644
index 0000000..3cb78f6
--- /dev/null
+++ b/database/migrations/2018_06_07_225520_create_metadata_table.php
@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateMetadataTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('metadata', function (Blueprint $table) {
+            $table->string('url');
+            $table->string('title');
+            $table->string('description');
+            $table->string('image');
+            $table->timestamps();
+
+            $table->index('url');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('metadata');
+    }
+}
diff --git a/routes/api.php b/routes/api.php
index 083a21b..4ef841a 100644
--- a/routes/api.php
+++ b/routes/api.php
@@ -1,6 +1,7 @@
 <?php
 
 use App\MetadataResolver\MetadataResolver;
+use App\Utilities\Formatter;
 use Illuminate\Http\Request;
 
 /*
@@ -18,13 +19,23 @@ Route::middleware('auth:api')->get('/user', function (Request $request) {
     return $request->user();
 });
 
-Route::get('/checkin/card', function (Request $request, MetadataResolver $resolver) {
+Route::get('/checkin/card', function (Request $request, MetadataResolver $resolver, Formatter $formatter) {
     $request->validate([
         'url:required|url'
     ]);
-    $url = $request->input('url');
+    $url = $formatter->normalizeUrl($request->input('url'));
+
+    $metadata = App\Metadata::find($url);
+    if ($metadata == null) {
+        $resolved = $resolver->resolve($url);
+        $metadata = App\Metadata::create([
+            'url' => $url,
+            'title' => $resolved->title,
+            'description' => $resolved->description,
+            'image' => $resolved->image
+        ]);
+    }
 
-    $metadata = $resolver->resolve($url);
     $response = response()->json($metadata);
     if (!config('app.debug')) {
         $response = $response->setCache(['public' => true, 'max_age' => 86400]);