In order to cheer Haruto up after his anime was such a flop, Itsuki gets him as well as Nayuta, Miyako and Chihiro together so they can play a TRPG. Itsuki usually plays girls in games, but for some reason, Chihiro makes out their character to be Itsuki’s character’s little sister, which leads to Nayuta and Miyako also making their characters sisters of the other two. Haruto becomes the GM and does whatever he wants.
No, wait. I love little sisters,
Mach mal halblang, ich steh auf Imoutos,
No, espera. ¡Me gustan las hermanitas,
No, espera. ¡Me gustan las hermanitas,
Attends, j’aime les petites sœurs,
je veux pas en devenir une.
No, aspetta. Io le sorelline le amo,
Não, espera aí. Eu gosto
de irmãs mais novas,
Постой, я люблю младших сестёр, да!