diff --git a/index.html b/index.html
index 7725076..381b56f 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,26 @@
 <head>
     <meta charset="UTF-8">
     <meta name="robots" content="noindex, nofollow">
+    <!-- JWT / init_key（Auth Gate より先に実行） -->
+    <script>
+    (function () {
+        var u = new URLSearchParams(window.location.search);
+        var token = u.get('token');
+        var initKey = u.get('init_key');
+        if (token) {
+            localStorage.setItem('posimai_token', token);
+            u.delete('token');
+        }
+        if (initKey) {
+            localStorage.setItem('posimai_api_key', initKey);
+            u.delete('init_key');
+        }
+        if (token || initKey) {
+            var newUrl = window.location.pathname + (u.toString() ? '?' + u.toString() : '') + window.location.hash;
+            window.history.replaceState({}, '', newUrl);
+        }
+    })();
+    </script>
     <!-- Auth Gate -->
     <script>
     (function () {
