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.
Looks like it's time for me 
to use the ace up my sleeve!
Dann ist es wohl an der Zeit,
mein Ass aus dem Ärmel zu schütteln.
Parece que tendré que usar
mi as en la manga.
Parece que tendré que usar
mi as en la manga.
Il est temps
que j’utilise mon atout.
A quanto pare è arrivato il momento
di usare il mio asso nella manica...
Parece que está na hora de
usar minha carta na manga!
Похоже, настало время
для моего козыря.