diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1caffeceef..8d2db60739 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 -
 
 ### Client
--
+-　Fix: 初回読み込み時などに、言語設定で不整合が発生することがある問題を修正
 
 ### Server
 -
diff --git a/packages/frontend-embed/public/loader/boot.js b/packages/frontend-embed/public/loader/boot.js
index ba6366b3db..9b3d27873b 100644
--- a/packages/frontend-embed/public/loader/boot.js
+++ b/packages/frontend-embed/public/loader/boot.js
@@ -70,6 +70,8 @@
 			importAppScript();
 		});
 	}
+
+	localStorage.setItem('lang', lang);
 	//#endregion
 
 	async function addStyle(styleText) {
diff --git a/packages/frontend/public/loader/boot.js b/packages/frontend/public/loader/boot.js
index ab4b158287..8aafb282aa 100644
--- a/packages/frontend/public/loader/boot.js
+++ b/packages/frontend/public/loader/boot.js
@@ -42,6 +42,8 @@
 		console.error('invalid lang value detected!!!', typeof lang, lang);
 		lang = 'en-US';
 	}
+
+	localStorage.setItem('lang', lang);
 	//#endregion
 
 	//#region Script