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...
Unknown. He may have one or he might not.
Nicht bekannt.
Könnte sein, muss aber nicht.
Irrelevante. Podría tener o no.
Irrelevante. Podría tener o no.
Incertain. Peut-être que oui,
peut-être que non.
Non si sa. Potrebbe avercela oppure no.
Desconhecido. Pode ser 
que sim, pode ser que não.
Неизвестно. Может есть, а может нет.