Is Yuri Seijin Naoko-san (2012) hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2012 · 1 episodes · PG-13 - Teens 13 or older
Comedy, Girls Love
Naoko-san is an alien from the planet Yuri, who is plotting to conquer the Earth by yurifying it. Misuzu is a junior high girl and is always troubled by Naoko-san, who lives on the roof of her house.
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