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...
Please mind the closing doors.
يُرجى الانتباه لإغلاق الأبواب
Vorsicht, Türen schließen.
Atención, las puertas van a cerrarse.
Atención, las puertas van a cerrarse.
Prenez garde 
à la fermeture des portes.
Attenzione, porte in chiusura.
Por favor, cuidado com as portas.