Welcome to Demon School! Iruma-kun Season 4 Episode 13 Story & Preview Cuts Released: They Were Supposed to Celebrate Iruma's Birthday, But...

The story and preview images for Episode 13 of the TV anime Welcome to Demon School! Iruma-kun (JP: Mairimashita! Iruma-kun) Season 4 have been revealed. This episode will air on Saturday, June 27 at 6:25 PM (JST), and will later be available on various international streaming platforms.

Episode 13 Story

Balam revealed to Iruma his past of sustaining a major injury, which is the reason why he wears a mask. This was to convey to Iruma the dangers of living in the Netherworld and the importance of life.

Then, the topic shifted to Iruma's birthday, but to their surprise, Iruma's birthday had already passed! To celebrate Iruma in a hurry, a grand Netherworld birthday party, the "Ritual of the Descent of Demons" (Kouma no Gi), is set to be held on a magnificent scale.

Introduction

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...

Spring 2026 Anime List

Source : Welcome to Demon School! Iruma-kun Official