Houkago no Magus

One morning, Haruka meets a boy named Aki, whom she assumes is a transfer student and treats kindly. She is surprised to learn he is 17 and her homeroom teacher. After Aki's arrival, strange occurrences begin to happen. He is revealed to be a logical magician capable of creating and altering phenomena. His goal is to defeat enemies hidden within the school. Haruka notices his suspicious actions and attempts to get closer to him, unknowingly stepping into the world of a logical magician.