Katarina Nounai Kaigi X
Japanese title: カタリナ脳内会議Ｘ
Alternative titles: Katarina's Brain Conference X
Type: ONA
Source: Light novel
Episodes: 23
Status: Finished Airing
Aired: Jun 21, 2021 to Sep 18, 2021
Duration: 55 sec per ep
Rating: PG-13 - Teens 13 or older
Studios: AQUA ARIS
Producers: Grooove
Genres: Comedy
Themes: Isekai, Villainess

Short specials posted on the official twitter account where the "Katarina Five" introduces Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... X.