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...
but she laughs like hearing 
it makes her really happy.
لكنها تضحك وكأنّ سماع تلك الكلمات يسعدها كثيرًا
Aber sie lacht stets so, als würde
sie sich wirklich darüber freuen.
pero sonríe como si se alegrase de oírlo.
pero sonríe como si se alegrase de oírlo.
elle sourit d’un air heureux.
sorride con aria piena di felicità.
vê-la sorrir me deixa feliz.