diff --git a/packages/client/src/scripts/theme.ts b/packages/client/src/scripts/theme.ts
index 3b7f003d0..d6b4d89a9 100644
--- a/packages/client/src/scripts/theme.ts
+++ b/packages/client/src/scripts/theme.ts
@@ -29,6 +29,7 @@ export const builtinThemes = [
 	require('@/themes/d-botanical.json5'),
 	require('@/themes/d-pumpkin.json5'),
 	require('@/themes/d-black.json5'),
+	require('@/themes/d-ncat.json5'),
 ] as Theme[];
 
 let timeout = null;
diff --git a/packages/client/src/store.ts b/packages/client/src/store.ts
index dc9c3b7b9..96411a6e9 100644
--- a/packages/client/src/store.ts
+++ b/packages/client/src/store.ts
@@ -242,8 +242,8 @@ type Plugin = {
  */
 export class ColdDeviceStorage {
 	public static default = {
-		lightTheme: require('@/themes/l-light.json5') as Theme,
-		darkTheme: require('@/themes/d-dark.json5') as Theme,
+		lightTheme: require('@/themes/d-ncat.json5') as Theme,
+		darkTheme: require('@/themes/d-ncat.json5') as Theme,
 		syncDeviceDarkMode: true,
 		plugins: [] as Plugin[],
 		mediaVolume: 0.5,
diff --git a/packages/client/src/themes/d-ncat.json5 b/packages/client/src/themes/d-ncat.json5
new file mode 100644
index 000000000..52eac0693
--- /dev/null
+++ b/packages/client/src/themes/d-ncat.json5
@@ -0,0 +1,15 @@
+{
+	id: '5cba19a8-b0e0-42b2-9ab2-35ffd623b045',
+	base: 'dark',
+	desc: 'ぬぁ～んဗ',
+	name: 'Ncat.v2',
+	props: {
+		bg: '#13141C',
+		fg: '#FFF',
+		navBg: '@bg',
+		panel: '@bg',
+		accent: '#96CCE7',
+		renote: '#B0E7CB',
+	},
+	author: '@n@nca10.net',
+}