Is Kyou no 5 no 2 Kagai Jugyou: Mizukake hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2008 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Ecchi, School, Seinen
A short 5-minute special included in the "「Kyou no Go no Ni」 Collectable BOX" Limited Edition DVD released on January 30, 2008.
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