Is Strike the Blood III hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2018 · 10 episodes · R+ - Mild Nudity
Action, Ecchi, Fantasy, Harem, School, Urban Fantasy, Vampire
Strange occurrences at sea result in Itogami Island becoming isolated. Nagisa continues to suffer effects from her previous exertions. A terrorist group known as Tartarus Lapse begins operations on the island. (Source: Wikipedia)
View on MyAnimeListShare
Check another title