Is Nineteen hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 1990 · 1 episodes · R - 17+ (violence & profanity)
Drama, Romance, Seinen
19-year-old Kubota is ready to find a girlfriend. The perfect chance arises when he meets Masana Fujisaka, his first love, in a club. She's just broken up with her longtime boyfriend and is surprised to run into Kubota, who sees that the perfect opportunity has just arisen.
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