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.
Four adventuring sisters have 
just arrived at the kingdom.
Auch unsere vier Schwestern
treffen in diesem Land ein.
Cuatro hermanas aventureras
acaban de llegar al reino.
Cuatro hermanas aventureras
acaban de llegar al reino.
Nos quatre sœurs viennent d’arriver
dans le royaume.
Quattro sorelle avventuriere
sono appena arrivate nel regno.
Quatro irmãs aventureiras
acabaram de chegar nesse reino.
И вот, опять, четыре сестры
вступили в его границы.