diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 238f4256d..a61be19d5 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1953,10 +1953,6 @@ pages:
       strReverse: "テキストを反転"
       _strReverse:
         arg1: "テキスト"
-      strConcat: "2つのテキストを連結"
-      _strConcat:
-        arg1: "テキスト1"
-        arg2: "テキスト2"
       join: "テキストを連結"
       _join:
         arg1: "リスト"
diff --git a/src/client/app/common/scripts/aiscript.ts b/src/client/app/common/scripts/aiscript.ts
index 1e486c455..a6fedcae0 100644
--- a/src/client/app/common/scripts/aiscript.ts
+++ b/src/client/app/common/scripts/aiscript.ts
@@ -80,7 +80,6 @@ const funcDefs = {
 	strPick:         { in: ['string', 'number'],           out: 'string',  category: 'text',       icon: faQuoteRight, },
 	strReplace:      { in: ['string', 'string', 'string'], out: 'string',  category: 'text',       icon: faQuoteRight, },
 	strReverse:      { in: ['string'],                     out: 'string',  category: 'text',       icon: faQuoteRight, },
-	strConcat:       { in: ['string', 'string'],           out: 'string',  category: 'text',       icon: faQuoteRight, },
 	join:            { in: ['stringArray', 'string'],      out: 'string',  category: 'text',       icon: faQuoteRight, },
 	stringToNumber:  { in: ['string'],                     out: 'number',  category: 'convert',    icon: faExchangeAlt, },
 	numberToString:  { in: ['number'],                     out: 'string',  category: 'convert',    icon: faExchangeAlt, },
@@ -500,7 +499,6 @@ export class AiScript {
 			strPick: (a, b) => a[b - 1],
 			strReplace: (a, b, c) => a.split(b).join(c),
 			strReverse: (a) => a.split('').reverse().join(''),
-			strConcat: (a, b) => a + b,
 			join: (texts, separator) => texts.join(separator || ''),
 			stringToNumber: (a) => parseInt(a),
 			numberToString: (a) => a.toString(),