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.
Since there's a lake in front of us, 
I guess we'll go for a swim!
Wenn wir schon einen See finden,
müssen wir fast 'ne Ecke drin planschen!
Como hay un lago,
¡creo que nos daremos un baño!
Como hay un lago,
¡creo que nos daremos un baño!
Avec un lac, forcément,
on doit se baigner !
Dato che è sulla strada,
possiamo approfittarne per fare una nuotatina!
Já que temos um lago a nossa
disposição, somos obrigadas a nadar!
Раз уж нашли,
то остаётся только купаться!