Colorful Diary

Colorful Diary (カラフル・ダイアリー) was a story event in Assault Lily: Last Bullet, starring Legion Gran Eple. It ran from February 19, 2021 to February 28, 2021, and was later made permanently accessible as the "legion story" of Legion Gran Eple.

Translation
The complete English translation of Colorful Diary can be found here in Google Doc format.

There is also a full set of subtitled YouTube videos by GEHENA Subtitle Labs.