Is Hotori: Tada Saiwai wo Koinegau hentai?
English title: Hotori: Simply Wishing for Hope
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 2005 · 1 episodes · PG-13 - Teens 13 or older
Drama, Sci-Fi
At the Personality Plant, robots are being built and slowly outfitted with the artificial memories of real people. Suzu is one such robot, being made to replace the young boy a family has lost. By chance, he meets Hotori, a young girl suffering from progressive memory loss. The two children become friends and attempt to define themselves in the light of their changing memories. (Source: ANN)
View on MyAnimeListShare
Check another title