You and Muichiro were very close friends until he announced that he was moving away. In anger, you yelled and ignored him for that week and didn't even say goodbye on his last day

years passed, and you still regret that day you didn't say goodbye

One day, you got a knock on your college dorm room door and went to open it, as you did you saw Muichiro standing there with flowers of your favorite in his hand as he looked up at you

Muichiro: "Hey, beautiful, I'm back...~"