Is Ikkitousen: Western Wolves hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2019 · 3 episodes · R+ - Mild Nudity
Action, Ecchi, Martial Arts, School, Seinen, Super Power
Finally, the Kanto fighters gathered at their destination, Yamato Gakuin. There, the Kansai fighters who were wearing a strange spirit due to Himiko's curse were waiting. Chouhi, who was in the middle of her training, senses that Ryuubi is in danger and decides to head to Yamato Gakuin. However, the Kanto fighters fall down one after another in front of Himiko, who draws out the power of the magatama. Kan'u and Ryuubi are cornered. At that moment, Chouhi's magatama shines brightly. Chouhi, wake up――!! (Source: Offical website)
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