The spinoff will be called Trinity Seven: Seven Days, and will be written and illustrated by Misaki Mori (Arifureta Nichijou de Sekaisaikyou).
The spinoff will debut August 9 in Monthly Dragon Age magazine.
This isn’t the first time Mori has contributed to the Trinity Seven universe: the manga-ka also did a short piece for the Trinity Seven Comic Anthology.
Here’s how Yen Press describes Trinity Seven:
Arata Kasuga transfers to the Royal Biblia Academy to solve the mystery of the destruction that is ravaging the world and that–more importantly–has stolen his cousin Hijiri from him. It’s a tough road that lies ahead of Arata, but nothing’s impossible when you have seven beautiful girls–each a master of her own magical art–at your side!