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 make various decisions 
throughout the game by rolling dice.
Während des Spiels wird vieles
mit Würfeln entschieden,
Las decisiones que tomen
se deciden tirando dados.
Las decisiones que toméis
se deciden tirando dados.
En jouant, on jette des dés
pour prendre plein de décisions.
In questi giochi l'esito di diverse azioni
si decide lanciando dei dadi.
Você fará várias decisões
durante o jogo jogando dados.
Во время игры для самых разных
действий нужно бросать кубики.