Itsuki Hashima is a popular, young novelist. However, he is obsessed with little sisters and his works seem to always include little sisters, so there’s some difficulty coming up with a new series. One day, his younger step-brother Chihiro and his colleagues, Hayato Fuwa, Nayuta Kani, and fellow college student, Miyako Shirakawa show up at his apartment. They enjoy dinner, drinks, and a game. That night, Nayuta makes advances towards Itsuki, but...
Like hell it's normal! You're a freak 
with a serious sister complex!
Das ist alles andere als normal!
¡Para nada!
¡Engendro con complejo de hermana!
¡Para nada!
¡Engendro con complejo de hermana!
Et puis quoi, encore ?
Abruti incestueux !
Col cazzo che è normale!
Maledetto maniaco delle sorelle minori!
O cacete que é normal! Seu degenerado
 viciado em irmãs mais novas!
Размечтался!