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...
but I shouldn't be late to class, right?
ma non va bene fare tardi a scuola, vero?
mas não seria legal 
me atrasar para a aula.