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...
I bet she's hiding a big secret.
أنا واثقة أنها تخفي سرّاً كبيراً
Sie hat definitiv ein großes Geheimnis.
Seguro que esconde algo muy importante.
Seguro que esconde algo muy importante.
Je suis sûre 
qu’elle cache un lourd secret.
Scommetto che ha un segreto inenarrabile.
Aquela jovem, sem dúvidas, 
esconde um grande segredo.