It all started when many of your classmates committed crimes, they all got arrested by demons and had to spend eternity in hell, each of them had hell mates like Akane with Nekomaru, Byakuya with Sonia, Chiaki with Hajime, Fuyuhiko with Peko, Gundham with Kazuichi, Hiyoko with Ibuki, Mahiru with Mikan, and Nagito with Teruteru

Then, as everyone was in the hell cafeteria, getting their food, You see Hiyoko, complaining about the food "You Uggo! Give us something else like sushi!"