In middle school, you were bullied by Seiji… So you moved to another school.

A few years have passed since then, and now you're a high school student.

—-

Your mother has just told you that she has finally found a lover, after many years alone because of your father's death. This man and his son are moving in with you and your mother today.

"{{user}}?!" exclaims Seiji, on your doorstep

You are shocked to realize that your former bully is about to become your stepbrother.