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

TV · 2016 · 24 episodes · PG-13 - Teens 13 or older
School, Shounen, Sports, Team Sports
The series is about two boys named Tsukushi and Jin. Tsukushi is a boy with no special talent or traits while Jin is considered a soccer genius. On one stormy night, Jin meets Tsukushi, and they get dragged into the world of soccer. (Source: MAL News)
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