LTLサイドストーリー is a side story collection of the LOOP THE LOOP series. The app contains the past of the characters and behind the scenes stories that were not covered in the main story. Although the sequel can still be enjoyed without reading the side stories, the series can only be fully appreciated by reading them. The app offers 24 free stories in vol.1, and the other volumes can be purchased through in-app purchases. Each volume contains 24 stories. The app also includes character profiles, such as height and weight. However, it is important to note that the app is written in Japanese and is only available for Android 4.0 and above.

The developer, sweet ampoule, is a team that creates visual novels and novel games, including LTL (LOOP THE LOOP) series, White Board, Dreaming Briar Rose, Blue Rose Language, Waiting at the Cat Park, and Whispering Devil series.