Katarina Nounai Kaigi X
Japanese title: カタリナ脳内会議Ｘ
Type: ONA
Episodes: 23
Source: Light novel
Genres: Comedy
Studios: AQUA ARIS
Producers: Grooove
Duration: 55 sec per ep
Rating: PG-13 - Teens 13 or older

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.