Arata Kasuga

アラタ カスは

Kasuga Arata used to live with his cousin and childhood friend Kasuga Hijiri, but one day something happened to the city he lives in, and an object was given to him by his cousin. When he finds out she could be alive he tries to become a magician, meeting with the Trinity Sevens in order to become a "Magus" and save Hijiri.