Season 1
It is a normal day; everyone from deranged military girl Tanya Degurechaff and 16-year-old isekai protagonist Satou Kazuma to expansionist overlord Ainz Ooal Gown and demon sisters Rem and Ram go on with their daily lives. Suddenly, a conspicuous red button begging to be pressed appears before them. Overcome by curiosity, the otherworldly characters push the button, sending them to an unfamiliar world. With no way of escaping, the characters must lead a normal school life and make acquaintances with the others. One thing is certain: the classroom full of fan-favorite eccentric personalities never gets boring!
Episodes
1 Come Together! Quartet Apr 10, 2019 
2 Tension! Introductions Apr 17, 2019 
3 Deadlock! Classmates Apr 24, 2019 
4 Encounter! Classmates May 1, 2019 
5 Explosion! Talent Show May 8, 2019 
6 Decision! Class Rep May 15, 2019 
7 Carry Out! Class Rep May 22, 2019 
8 Prepare! Field Trip May 28, 2019 
9 Enjoy! Field Trip Jun 4, 2019 
10 Join In! Rivals Jun 12, 2019 
11 Work Together! Field Day Jun 19, 2019 
12 Band Together! Quartet Jun 26, 2019