Midnight Horror School
Japanese title: ミッドナイトホラースクール
Type: TV
Source: Unknown
Episodes: 52
Status: Finished Airing
Aired: Oct 1, 2003 to Mar 24, 2004
Broadcast: Wednesdays at 15:30 (JST)
Duration: 11 min per ep
Producers: Milky Cartoon
Genres: Comedy

The school has 26 students with each name of them beginning with a letter of the alphabet in order and a color, 3 teachers, 3 classrooms, a library, a cafeteria, a music room, a playroom, a fountain, a skeleton playground, a graveyard and several school staff. 

(Source: Wikipedia)