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...
It's impossible that any girl other than 
me would have feelings for him!
!من المستحيل أن تُعجَب فتاةٌ غيري به
Es ist ausgeschlossen, dass eine andere
Frau neben mir Gefühle für ihn hat.
¡Es imposible que otra chica 
aparte de mí sienta algo por él!
¡Es imposible que otra chica 
aparte de mí sienta algo por él!
Personne d’autre que moi 
ne pourrait aimer Takeo,
È impossibile che Takeo
piaccia a qualcun altro oltre a me!
É impensável que outra
 mulher goste dele como eu!