I'm Not Your Brother

The protagonist suddenly traveled to a person who was about to die. This guy's parents are both dead, and he has a 13-year-old sister who has good genetics and is very handsome. Her sister is also a little lolita. . . In the end, the protagonist happily decided, "Hey, I'm not your brother!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.