Responses
Wasn't the girl first?
Im confused.
It says the brother cheated on her once, but he did it first and in a way that really messed her up so she became a serial cheater in turn. They're just a toxic couple.
Why become a serial cheater, just break up!
Dislike Shino as well, but from what I read Natsuki (Seryou's bro) cheated on her first and somehow it really damaged her. So, they're both toxic for each other and should just keep their mess away from our MCs.