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's my first girlfriend.
وهي أوّل حبيبة أحظى بها في حياتي
Sie ist meine erste Freundin.
Es mi primera novia.
Es mi primera novia.
C’est ma toute première 
petite amie.
È la mia prima ragazza.
É a minha primeira namorada.