Kyou no 5 no 2 Kagai Jugyou: Mizukake
Japanese title: 今日の５の２課外授業:ミズカケ
Type: Special
Episodes: 1
Source: Manga
Genres: Comedy, Ecchi
Studios: Lyrics
Duration: 5 min
Rating: PG-13 - Teens 13 or older

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