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 a secret.
إنها تخفي سرّاً
Sie hat ein Geheimnis.
Tiene un secreto.
Tiene un secreto.
Cette fille
Quella ragazza... ha un segreto.
Essa garota esconde um segredo.