우리들의 D-day 디데이 is a free lifestyle app designed by tofuside for Android users. With this app, you can easily keep track of your important dates such as anniversaries, appointments, exams, interviews, and other events. The app allows you to enter your important dates quickly and easily, and it will remind you of them via the status bar and home screen widgets.

The app is user-friendly and includes only the necessary features for effective schedule management. It is designed to prevent being killed by task management apps like Advanced Task Killer. The app requires access to your storage to save and back up your D-day list. You can also choose to allow access to your phone, contacts, usage history, and device and app history to enable additional features. However, these permissions are optional and can be disabled.

Overall, 우리들의 D-day 디데이 is an excellent app for anyone who wants to keep track of their important dates without any fuss. If you have any feedback, you can use the "send mail inquiry" feature in the settings menu to contact the developer.