Kyou no 5 no 2 Kagai Jugyou: Mizukake
Japanese title: 今日の５の２課外授業:ミズカケ
Alternative titles: Kyou no Go no Ni Special, Kyou no Go no Ni Tokuten, Kyou no Go no Ni Special Class: Water Splash, Kyou no Go no Ni Extra lesson: Water Splash, Today in Class 5-2 Special
Type: Special
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Jan 30, 2008
Duration: 5 min
Rating: PG-13 - Teens 13 or older
Studios: Lyrics
Genres: Comedy, Ecchi
Themes: School
Demographics: Seinen

A short 5-minute special included in the "「Kyou no Go no Ni」 Collectable BOX" Limited Edition DVD released on January 30, 2008.