Is Tsukuyomi: Moon Phase Special hentai?

Special · 2006 · 1 episodes · PG-13 - Teens 13 or older

Comedy, Gag Humor

Omake Special from the final DVD volume. The Special storyline has very little to do with the original series outside of having some of the same characters, and has a completely different storyline which does not fit into anything which came before it. (Source: AniDB)