Is Candy Boy Episode: EX01 - Mirai Yohouzu hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2008 · 1 episodes · PG-13 - Teens 13 or older
Girls Love, School
A dvd only prequel to the Candy Boy series. Twin sisters, Yukino and Kanade Sakurai, move to a new school in the big city of Tokyo but not everything is quite like they expected.
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