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.
The world for the game is an 
orthodox world of swords and magic.
El mundo del juego es un mundo
normal de espada y brujería.
El mundo del juego es un mundo
normal de magia y espada.
Le jeu se déroule dans un bon vieux
monde d’épées et de magie.
L'ambientazione di questo gioco in particolare
è un classico mondo fantasy fatto di spade e magie.
Esse jogo se passa num mundo
ortodoxo de espadas e mágica.
Сеттинг: классический мир мечей и магии.