Is Zettai Shougeki: Platonic Heart hentai?
English title: Master of Martial Hearts
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2008 · 5 episodes · R+ - Mild Nudity
Action, Ecchi, Martial Arts
The story centers on the Platonic Heart, a jewel that—according to an old urban legend—can grant any wish when collected. Only a chosen few are allowed to compete in the Platonic Heart hunt, and high school junior Aya Iseshima is one of 11 girls and women who are taking part.
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