Drop everything and look at the trailer first — then come back. Welcome to Demon School! Iruma-kun Season 4 debuts April 4, 2026 from Bandai Namco Pictures. 24 eps, comedy. The opener moves with the kind of confidence you don't usually get in episode one.
The premise
Fourth season of Mairimashita! Iruma-kun. It's the kind of premise that sounds tidy in two sentences and gets weirder on screen — in a good way. Stick around past the cold open.
Studio side
Bandai Namco Pictures's on the line. Their recent ledger is the thing flagging this as more than spring filler — the storyboards on the opener show actual budget, not contractual minimum.
Calendar slot
Saturdays at 18:25 (JST). Episode count: 24. Same-day simulcast windows are on the usual Western streamers — check your local Crunchyroll, HIDIVE, or Hulu listing for the timed slot.
The case for it
Sitting at 8.14 with 6,541 early scorers. The signal isn't peak hype — it's retention, which is the metric that actually matters when you're picking what survives your rotation. Add it to the rotation. It's not the loudest pick of the season; that's exactly what makes it a worthwhile one.