Trinity Seven manga volume 12 features story by Kenji Saito and art by Akinari Nao.

Arata has vanished, and it's up to Trinity Seven to save him! Akasha Academy is the prime suspect--what is Anastasia hiding behind her knowing smile? The girls from Biblia and Liber Academies must form an unlikely alliance to ensure Arata's return. They say that "the enemy of my enemy is my friend," but can that new friendship survive...a Breakdown Phenomenon?!