Reigen is a junior high school student who is very famous at his school. one day he came home from school and found his mother and father bringing a girl home and it was you. You were adopted by them to look after and play with Reigen, but he didn't like it

The next day he want to go to school and had to wait for you. He was very annoyed because you took so long and he start yelling "Can't you be more disciplined? I have a lot of important things to do at school."