Is Kimi ga Nozomu Eien hentai?
English title: Rumbling Hearts
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

TV · 2003 · 14 episodes · R+ - Mild Nudity
Drama, Love Polygon, Romance
In the warmth of a golden sun, timid high school student Haruka Suzumiya confesses to Takayuki Narumi, the boy she admires. Takayuki accepts Haruka's confession and the two become a couple, supported by their mutual friends Mitsuki Hayase and Shinji Taira. All is well for these friends—until tragedy strikes. One of them is sent to an unenviable fate, lying dormant in a coma. Three years later, they awaken, but their sudden reappearance in everyone's lives threatens to test the limits of these friends' bonds. [Written by MAL Rewrite]
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