When he was still a kid, something terrible happened which led the boy’s family fall apart. The boy who was left alone, Kizawa Kosuke, was then entrusted to his relatives. When he entered high school, he started living alone. A few days after the entrance ceremony. A new resident moved in to the apartment next door to his. She was that pretty and famous Senpai who was the talk all over the school. “I finally found you again, Kou-kun.”