Is Kikumana hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2001 · 1 episodes · PG-13 - Teens 13 or older
Avant Garde, Psychological
This work "Kikumana" is an animation of a girl called Kikumana who acts like in a stage performance, the role defeated by such an ill circumstance though she tries to find herself. The primal aim is to get the audience feeling a strange atmosphere spread from this work. The image has a pictorial atmosphere and a documentary touch at the same time. Unrealistic phenomena take place there. (Source: AniDB)
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