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 has something she 
doesn't want to tell him.
Zumindest hat sie etwas,
das sie ihm nicht sagen mag.
Hay algo que no le quiere contar.
Hay algo que no le quiere contar.
Non ha la coscienza del tutto a posto con Takeo.
Alguma coisa que não quer contar para ele.