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Season One of the Mairimashita! Iruma-kun anime series first aired from October 5, 2019 to March 7, 2020, running for 23 episodes. It was initially announced in the 10th issue of the 2019 Weekly Shōnen Champion magazine, which released on February 21.
New episodes debuted every Saturday, first airing on Japanese network NHK Educational TV, then releasing on international streaming services Crunchyroll and VRV shortly afterwards. The airing of Episode 23 was followed by an announcement of a second season.
Suzuki Iruma, human, 14, one day finds himself taken against his will into the world of demons. To add to his predicament, his doting owner and self-appointed "Grandpa" is the chair-demon at his new school. In order to survive, Iruma must deal with a haughty student who challenges him to a duel, a girl with adjustment issues, and so many more scary beings! Can this ultimate pacifist dodge the slings and arrows that are flung his way? As he struggles frantically, Iruma's innate kindness begins to win over enemies.