Trinity Seven: Levi Story

 is a spin-off series featuring Levi Kazama from the Trintiy Seven manga, written by the original author, Kenji Saito, illustrated by Sutarō Hanao with original character designs by Akinari Nao. The first chapter was released on November 9, 2015  and the first volume was released on May 9, 2016. In Monthly Dragon Age December 2016 issue, the final chapter was announced to be published in the January 2017 on December 9.

Synopsis
The Biblia Academy's Headmaster has asked a Trinity Seven Kazama Levi, looking for the mythic weapon "Murasame", the legendary demonic sword. Along with Charme (Big Boobs), a kouhai mage that admires to Levi, she will infiltrate to a town where is said "Murasame" is sealed, however, a Breakdown Phenomenon occurs- Aiming to that treasure Lugh appears, who is the same "Envy" mage, also going to war, the leader of the Ninja Army's Five Shadow Magic Elements, Kashin Ryuhime, the story of a ninja having a heroic battle

Trivia

 * The spin-off was formerly announced in the Kadokawa's Monthly Dragon Age November 2015 issue on October 9, 2015.