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.
You've all arrived at the castle 
town in Gagagia Kingdom.
Ihr befindet euch in der Burgstadt
des Königreichs Gagagia.
Todos llegan al castillo
del reino de Gagagia.
Todos llegáis al castillo
del reino de Gagagia.
Vous arrivez dans une ville
du royaume de Gagagia.
Siete appena arrivate
nella capitale del regno di Gagagia.
Vocês todas chegaram na
capital do Reino de Gagagia.
Все вместе вы прибыли
в столицу королевства.