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 higher your parameters, 
the more dice you get.
je stärker man wird, umso mehr
Würfel darf man verwenden.
Cuanto mejor sea su estadística,
más dados podrán usar.
A mejores estadísticas,
más dados podréis usar.
Plus un attribut est élevé,
plus on utilise de dés.
Più una caratteristica è alta,
più dadi puoi lanciare.
Quanto maior seus atributos,
mais dados você receberá.
И чем выше умения персонажа,
тем больше кубиков требуется.