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...
For the very first time in my life,
هذه المرة الأولى التي أُعجب فيها
بفتاةٍ تبادلني نفس المشاعر
Das ist das erste Mal
in meinem Leben,
Por primera vez en mi vida, le 
gusto a la chica que me gusta.
Por primera vez en mi vida, le 
gusto a la chica que me gusta.
Per la prima volta,
Pela primeira vez,