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...
Since it's unknown, I guess 
that's not an important factor.
Nicht bekannt … muss bedeuten,
dass es nicht weiter relevant ist.
Como no se sabe,
supongo que no es importante.
Como no se sabe,
supongo que no es importante.
Si on ne sait pas,
Dato che non si sa,
Como é desconhecido,
 não deve ser algo importante.
То есть к задаче это не имеет отношения…