Suzuki Iruma attends Demon School Babyls while hiding the fact that he's a human. He’s made many demon friends and even begun enjoying his life in the netherworld while playing a huge role in major events! He's been rising through the ranks of the netherworld and also starting to gain attention outside of school.

Iruma's next challenge will be the Music Festival, where the bonds between him and his classmates will be put to the test! They’ve been tasked with getting all thirteen members of the Misfit Class to Rank 4: an unprecedented, impossible goal they can only achieve by winning the Music Festival. However, one of his classmates is a demon who is not allowed to stand out...

Will all thirteen students of Iruma's class be able to perform on that stage?!