日本カレンダー is a simple and well-designed calendar app that allows users to check Japanese holidays. The app has a user-friendly interface and provides various features for easy navigation and customization.

The app allows users to view the calendar of the next or previous month by selecting the "翌月" or "前月" buttons or by swiping left or right on the touchscreen. Users can also easily switch to the current month by selecting the "今月" button or by choosing "今月" after selecting the device's menu button.

日本カレンダー also includes a memo feature, where users can create and save memos for specific dates. By selecting a date, users can access the editing screen to create or review memos.

The app offers customization options such as changing the calendar display language between Japanese and partially English, selecting the starting day of the week (Sunday or Monday), adjusting the line width of the calendar, changing the background color, and hiding unnecessary buttons.

Additionally, the app provides a backup feature, allowing users to backup their memos to the main storage for easy data transfer during device changes or in case of emergencies.

Overall, 日本カレンダー is a reliable and convenient calendar app for users who want a simple and functional tool to check Japanese holidays and manage their schedules.