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...
Y-You can start at any time, Senpai!
Jaha! Schieß los, wenn du so weit bist, Senpai!
¡Puedes empezar cuando quieras!
¡Puedes empezar cuando quieras!
C’est quand tu veux, Itsuki !
I-Inizia quando vuoi, senpai!
V-Você pode começar 
assim que quiser, Senpai!
Задай мне посильнее, Ицуки!