Mairimashita! Iruma-kun 3rd Season – 17 - Lost in Anime

I'm almost sure the "Is it you?" guy (who notably only appears to Iruma, not Lead-kun) is a very important (missing) demon. Read more

Volume 20, Mairimashita! Iruma-kun Wiki

Mairimashita! Iruma-kun 3rd Season - 08 - 17 - Lost in Anime

DISC] Mairimashita Iruma-kun Chapter 200! A Gathering of Heroes. + Kalego gaiden : r/manga

Mairimashita! Iruma-kun 3rd Season - 17 - 37 - Lost in Anime

Mairimashita! Iruma-kun 3rd Season - 17 - 44 - Lost in Anime

Mairimashita! Iruma-kun 3rd Season - 04 - 17 - Lost in Anime

Mairimashita! Iruma-kun 3rd Season - 17 - 49 - Lost in Anime

Chapter 36, Mairimashita! Iruma-kun Wiki

DISC] Mairimashita! Iruma-kun Chapter 250: Carelessness is Your Biggest Nemesis : r/manga

DISC] Mairimashita Iruma-kun chapter 205. Speaking of the Demon King. : r/manga