Rakuten TV (楽天TV) is a Japanese video-on-demand service that offers a wide variety of movies, TV shows, anime, and sports content. The Rakuten TV旧:楽天SHOWTIME app is a dedicated playback app for iOS and iPadOS devices that allows you to watch Rakuten TV's video content.

To use the app, you need to have an existing Rakuten ID. The app does not allow you to rent or purchase content within the app. However, it offers several playback features such as slow and fast playback, background playback, Picture in Picture playback, Chromecast playback, and offline playback.

The app offers a diverse range of content, including movies (both foreign and domestic), TV shows (both foreign and domestic), anime, sports, and documentaries. With its multi-device compatibility, you can watch your favorite shows on your smartphone, tablet, PC, TV, or game console.

Please note that some content cannot be played directly from within the app and must be played through the web browser on your iOS or iPadOS device.

Overall, the Rakuten TV旧:楽天SHOWTIME app is a great choice for those who want to enjoy a wide variety of video content on their iOS or iPadOS devices.