diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a696bc5ce..2e0db1938 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,8 +26,10 @@ Also, when you start implementation, assign yourself to the Issue (if you cannot
 
 ## Well-known branches
 - **`master`** branch is tracking the latest release and used for production purposes.
-- **`develop`** branch is where we work for the next release.
+- **`honi-dev`** branch is where we work for the next release.
 	- When you create a PR, basically target it to this branch.
+- **`develop`** branch is where original misskey team work for the next release.
+  - You **must not** target your PR to this branch.
 - **`l10n_develop`** branch is reserved for localization management.
 
 ## Creating a PR
diff --git a/packages/client/src/widgets/calendar.vue b/packages/client/src/widgets/calendar.vue
index c6a69b3fb..e0b82bb13 100644
--- a/packages/client/src/widgets/calendar.vue
+++ b/packages/client/src/widgets/calendar.vue
@@ -76,8 +76,13 @@ const tick = () => {
 	const ny = now.getFullYear();
 
 	year.value = ny;
-	month.value = nm + 1;
-	day.value = nd;
+	if (nd === 1 && nm + 1 === 4) { // エイプリルフール
+		month.value = 3;
+		day.value = 32;
+	} else { // 通常
+		month.value = nm + 1;
+		day.value = nd;
+	}
 	weekDay.value = [
 		i18n.ts._weekday.sunday,
 		i18n.ts._weekday.monday,