Momonga, now known as the Sorcerer King Ains Ooal Gown, rallies the Sorcerer Kingdom and its undead army to join the fight alongside the Sacred Kingdom and the Slane Theocracy in hopes to defeat the Demon Emperor Jaldabaoth.

In this prequel spin-off series, Megumin from the Crimson Demon Clan devotes all of her energy into perfecting Explosion Magic - and nothing else.

An asocial teenager, Neku Sakuraba, mysteriously finds himself a part of the Reapers' Game, and must make allies to complete the game's missions if he wants to survive.