Mamono-tachi no Kunou
Japanese title: 魔物たちの苦悩
Alternative titles: Maou-jou de Oyasumi Mini Anime, Sleepy Princess in the Demon Castle Mini Anime
Type: ONA
Source: Manga
Episodes: 12
Status: Finished Airing
Aired: Oct 10, 2020 to Dec 24, 2020
Duration: 2 min per ep
Rating: PG-13 - Teens 13 or older
Studios: Doga Kobo, AQUA ARIS
Genres: Comedy

Chibi shorts to Maou-jou de Oyasumi released on the anime's Twitter page.