Trinity Seven 1 Saitou Kenji (2015)

Arata Kasuga is living an ordinary life with his cousin, Hijiri, when a mysterious event known as the Breakdown Phenomenon makes her vanish before his eyes. Determined to eradicate the phenomenon and bring Hijiri back, Arata enrolls at Royal Biblia Academy. The road ahead is difficult, but nothing seems impossible with seven beautiful girls by his side, each a master of her own magical art. The romantic comedy and sometimes-serious wizard school story begins.