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.
I have the ability of reproducing 
any weapon I've seen before.
Ihre Spezialfähigkeit ist das Replizieren und
Benutzen jeder Waffe, die sie erblickt.
Tengo la habilidad de reproducir
cualquier arma que haya visto antes.
Tengo la habilidad de reproducir
cualquier arma que haya visto antes.
Elle a la capacité de reproduire
toute arme qu’elle a vue.
Ho un'abilità speciale che mi permette
di riprodurre qualsiasi arma abbia visto.
Eu tenho a habilidade de reproduzir
qualquer arma que eu tenha visto antes.
Могу воссоздать любое оружие,
которое попалось мне на глаза.