Ai, Sunakawa's sister three years his senior, is shocked to learn during a home visit that Takeo is dating. Having secretly harbored feelings of her own for Takeo, Ai is suspicious of Takeo's girlfriend and launches her own investigation...
She wouldn't have fallen in love with him
Die hätte sich doch nie in ihn verliebt,
Non si sarebbe innamorata di lui
Se não tivesse um bom motivo,