Houkago no Majutsushi

One morning, Harihata Haruka meets a boy, Akitsu Aki. She thought he was a transfer student, so she treat him kindly, but she was shocked that when she found out he was 17 years old and was her homeroom teacher. Meanwhile, with Aki's appearence, a mysterious phenomenon starts to occurr simultaneously. It turn out to be, Aki was a logical magician that creates an all possible creation, twisting a phenomemon. He had a hidden intention that defeat enermies that lurking around in school. Haruka was aware of Aki's suspicious behavior and she tried to get close to him but her act was a stepping into world of logical magician. (Source: jCafe)