The Magic of Promises

The Magic of Promises (約束の魔法) was a story event in Assault Lily: Last Bullet, in collaboration with the film Magical Girl Lyrical Nanoha: Detonation, starring Takamachi Nanoha, Fate T. Harlaown and Yagami Hayate from the Nanoha series, as well as the non-playable civilian Katahira Nanami. The members of Team Hitotsuyanagi all feature in supporting roles.

The event ran from August 31, 2021 to September 14, 2021, and was rerun in May 2022.

Translation
The complete English translation of The Magic of Promises can be found here in Google Doc format.

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