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Chances are you've been watching Mairimashita! Iruma-kun 4th Season and seeing this every week without realizing it's its own standalone entry — the opening theme music video for 'Ichi Ni no San' by Penthouse. At just a single episode runtime, it's less than two minutes of your life, but it's a genuinely fun little capsule of everything the show does well. The animation is fluid and colorful, bouncing between the human world and the demon school setting, tossing familiar characters into the frame with the kind of energy that makes you actually want to sit through the opening instead of skipping it. The song itself is catchy without being obnoxious — upbeat, a little goofy, fits Iruma's whole deal of a human kid fumbling through demon society while desperately trying to keep his identity secret. There's no plot here in any traditional sense, but as a mood piece it works. Think of it like a highlight reel that captures the friendship, the chaos, and the warmth of the series in under two minutes. If you liked the vibe of Blue Exorcist or The Devil is a Part-Timer — that whole 'fish out of water in a supernatural world' energy — and want a quick taste of what Iruma-kun feels like before committing to a full season, this is an oddly decent entry point. It's a music video. It knows what it is. It does its job well.