It's a typical day for everyone, from crazed military girl Tanya Degurechaff and 16-year-old isekai protagonist Satou Kazuma to expansionist tyrant Ainz Ooal Gown and demon sisters Rem and Ram. Suddenly, a prominent red button begs to be pressed in front of them. Curiosity drives the alien figures to press the button, transporting them to an unknown planet. With no way out, the protagonists must live a normal school life and make friends with the other students. One thing is certain: the classroom full of fan-favorite quirky characters is never dull!