Is Valkyrie Drive: Mermaid Specials hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

Special · 2015 · 6 episodes · R+ - Mild Nudity
Action, Erotica, Fantasy, Girls Love
Mini OVA episodes bundled with the Blu-ray and DVD releases of Valkyrie Drive: Mermaid.
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