Is Natsu-iro no Sunadokei hentai?
English title: Sandglass of Summer Colors
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

OVA · 2004 · 2 episodes · PG-13 - Teens 13 or older
Drama, Romance, Sci-Fi, Time Travel
With summer vacation about to begin, Koutarou Makimura plans to confess his love to the popular Kaho Serizawa. After a strange incident, however, he finds himself traveling through time, experiencing the vacation out of order. When he learns that Kaho is going to die just before they return to school, Koutarou must use his knowledge of future events to prevent her death, no matter the cost. [Written by MAL Rewrite]
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