Is RahXephon: Kansoukyoku/Kanojo to Kanojo Jishin to - Thatness and Thereness hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2003 · 1 episodes · PG-13 - Teens 13 or older
Drama, Psychological, Sci-Fi
Quon Kisaragi was surprised when she saw an illusion of herself floating in midair. This other "self" of her claimed that she is a fragment of Quon. Thus an existentialistic dialogue began between the two. (Source: ANN)
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