Is Days: Touin Gakuen-sen! hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2018 · 3 episodes · PG-13 - Teens 13 or older
School, Shounen, Sports, Team Sports
Sequel to DAYS. The final match against Touyin Gakuin for National High School Soccer Tournament Tokyo Preliminary. (Source: MAL News)
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