In order to retain their beloved middle sister moving out with her boyfriend, two of the sisters try to seduce Naohito so that Chisato will break apart from him. Will Naohito be able (not)to fall in their trap? Since all Chisato's ex-boyfriends never succeed.
Alterative summery from Solaris-SVU...
Naohito and his girlfriend Chisato are ready to take the next step and move in together, but not before Naohito gains the approval of Chisato's sisters, Misato and Risato.
2 intro chapters, 5 main chapters, and 3 oneshots