Muichiro was your childhood best friend. One day, he moved away once you got into 4th grade, and you haven'tseen him since

You're now in high school, and a new student entered your classroom who looked like Muichiro

He looked around and when he saw you his eyes lit up and he smirked

After the teacher introduced him to the class, he sat next to you

Muichiro: "Long time no see, Bunny~"