diff --git a/app/MetadataResolver/MetadataResolver.php b/app/MetadataResolver/MetadataResolver.php
index a76c30d..64cdefb 100644
--- a/app/MetadataResolver/MetadataResolver.php
+++ b/app/MetadataResolver/MetadataResolver.php
@@ -27,6 +27,7 @@ class MetadataResolver implements Resolver
         '~ci-en\.jp/creator/\d+/article/\d+~' => CienResolver::class,
         '~www\.plurk\.com\/p\/.*~' => PlurkResolver::class,
         '~(adult\.)?contents\.fc2\.com\/article_search\.php\?id=\d+~' => FC2ContentsResolver::class,
+        '~store\.steampowered\.com/app/\d+~' => SteamResolver::class,
     ];
 
     public $mimeTypes = [
diff --git a/app/MetadataResolver/SteamResolver.php b/app/MetadataResolver/SteamResolver.php
new file mode 100644
index 0000000..987c97b
--- /dev/null
+++ b/app/MetadataResolver/SteamResolver.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace App\MetadataResolver;
+
+use GuzzleHttp\Client;
+
+class SteamResolver implements Resolver
+{
+    /**
+     * @var Client
+     */
+    private $client;
+
+    public function __construct(Client $client)
+    {
+        $this->client = $client;
+    }
+
+    public function resolve(string $url): Metadata
+    {
+        if (preg_match('~store\.steampowered\.com/app/(\d+)~', $url, $matches) !== 1) {
+            throw new \RuntimeException("Unmatched URL Pattern: $url");
+        }
+        $appid = $matches[1];
+
+        $res = $this->client->get('https://store.steampowered.com/api/appdetails/?l=japanese&appids=' . $appid);
+        if ($res->getStatusCode() === 200) {
+            $json = json_decode($res->getBody()->getContents(), true);
+            if ($json[$appid]['success'] === false) {
+                throw new \RuntimeException("API response [$appid][success] is false: $url");
+            }
+            $data = $json[$appid]['data'];
+            $metadata = new Metadata();
+
+            $metadata->title = $data['name'] ?? '';
+            $metadata->description = strip_tags(str_replace('<br />', PHP_EOL, html_entity_decode($data['short_description'] ?? '')));
+            $metadata->image = $data['header_image'] ?? '';
+
+            return $metadata;
+        } else {
+            throw new \RuntimeException("{$res->getStatusCode()}: $url");
+        }
+    }
+}
diff --git a/tests/Unit/MetadataResolver/SteamResolverTest.php b/tests/Unit/MetadataResolver/SteamResolverTest.php
new file mode 100644
index 0000000..dadaf47
--- /dev/null
+++ b/tests/Unit/MetadataResolver/SteamResolverTest.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace Tests\Unit\MetadataResolver;
+
+use App\MetadataResolver\SteamResolver;
+use Tests\TestCase;
+
+class SteamResolverTest extends TestCase
+{
+    use CreateMockedResolver;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        if (!$this->shouldUseMock()) {
+            sleep(1);
+        }
+    }
+
+    public function test()
+    {
+        $responseText = file_get_contents(__DIR__ . '/../../fixture/Steam/test.json');
+
+        $this->createResolver(SteamResolver::class, $responseText);
+
+        $metadata = $this->resolver->resolve('https://store.steampowered.com/app/333600');
+        $this->assertEquals('NEKOPARA Vol. 1', $metadata->title);
+        $this->assertEquals('水無月嘉祥(みなづき かしょう)は伝統ある老舗和菓子屋である実家を出て、 パティシエとして自身のケーキ屋『ラ・ソレイユ』を一人で開店する。 しかし実家から送った引っ越し荷物の中に、 実家で飼っていた人型ネコのショコラとバニラが紛れ込んでいた。', $metadata->description);
+        $this->assertStringStartsWith('https://steamcdn-a.akamaihd.net/steam/apps/333600/header.jpg?t=', $metadata->image);
+    }
+
+    public function testR18()
+    {
+        $responseText = file_get_contents(__DIR__ . '/../../fixture/Steam/testR18.json');
+
+        $this->createResolver(SteamResolver::class, $responseText);
+
+        $metadata = $this->resolver->resolve('https://store.steampowered.com/app/1077580');
+        $this->assertEquals('Broke Girl  | 負債千金', $metadata->title);
+        $this->assertEquals('苦労知らずに育ったお嬢様は一夜にして1000万の借金を背負うことになった。借金を返済するために働かなければならない。しかし世間には悪意が満ちており、男達はお金で彼女を誘うか凌辱することしか考えていない。', $metadata->description);
+        $this->assertStringStartsWith('https://steamcdn-a.akamaihd.net/steam/apps/1077580/header.jpg?t=', $metadata->image);
+    }
+
+    public function testNotFound()
+    {
+        $this->expectException(\RuntimeException::class);
+
+        $responseText = file_get_contents(__DIR__ . '/../../fixture/Steam/testNotFound.json');
+
+        $this->createResolver(SteamResolver::class, $responseText);
+
+        $this->resolver->resolve('https://store.steampowered.com/app/1');
+    }
+}
diff --git a/tests/fixture/Steam/test.json b/tests/fixture/Steam/test.json
new file mode 100644
index 0000000..3c238f4
--- /dev/null
+++ b/tests/fixture/Steam/test.json
@@ -0,0 +1,10 @@
+{
+  "333600": {
+    "success": true,
+    "data": {
+      "name": "NEKOPARA Vol. 1",
+      "short_description": "水無月嘉祥(みなづき かしょう)は伝統ある老舗和菓子屋である実家を出て、 パティシエとして自身のケーキ屋『ラ・ソレイユ』を一人で開店する。 しかし実家から送った引っ越し荷物の中に、 実家で飼っていた人型ネコのショコラとバニラが紛れ込んでいた。",
+      "header_image": "https://steamcdn-a.akamaihd.net/steam/apps/333600/header.jpg?t=1558382831"
+    }
+  }
+}
diff --git a/tests/fixture/Steam/testNotFound.json b/tests/fixture/Steam/testNotFound.json
new file mode 100644
index 0000000..0c538d2
--- /dev/null
+++ b/tests/fixture/Steam/testNotFound.json
@@ -0,0 +1 @@
+{"1":{"success":false}}
\ No newline at end of file
diff --git a/tests/fixture/Steam/testR18.json b/tests/fixture/Steam/testR18.json
new file mode 100644
index 0000000..5edf5a1
--- /dev/null
+++ b/tests/fixture/Steam/testR18.json
@@ -0,0 +1,10 @@
+{
+  "1077580": {
+    "success": true,
+    "data": {
+      "name": "Broke Girl  | 負債千金",
+      "short_description": "苦労知らずに育ったお嬢様は一夜にして1000万の借金を背負うことになった。借金を返済するために働かなければならない。しかし世間には悪意が満ちており、男達はお金で彼女を誘うか凌辱することしか考えていない。",
+      "header_image": "https://steamcdn-a.akamaihd.net/steam/apps/1077580/header.jpg?t=1559506319"
+    }
+  }
+}