"がんばれ！ルルロロ Free" is a free lifestyle app developed by GalleryApp for Android devices. This app is a calendar application that features the adorable characters from the popular children's book series, "くまのがっこう" or "Kuma no Gakkou" in Japan. The app allows users to keep track of their schedules, set reminders, and make notes with ease.

The app comes with several features such as schedule registration, copy, and deletion, as well as the ability to repeat schedules every week, making it perfect for tracking weekly activities such as classes or meetings. Additionally, the app includes a daily diary feature called "だいありー" or "Diary," where users can jot down their thoughts or daily events. The app also includes a memo feature that allows users to take quick notes.

Overall, "がんばれ！ルルロロ Free" is a straightforward, functional, and cute calendar app that is perfect for anyone looking for an easy-to-use and fun way to keep track of their schedules.