Is Dragon Ball Z Special 2: Zetsubou e no Hankou!! Nokosareta Chousenshi - Gohan to Trunks hentai?
English title: Dragon Ball Z: The History of Trunks
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV Special · 1993 · 1 episodes · PG-13 - Teens 13 or older
Adventure, Drama, Fantasy, Shounen
It has been thirteen years since the Androids began their killing rampage and Son Gohan is the only person fighting back. He takes Bulma's son Trunks as a student and even gives his own life to save Trunks's. Now Trunks must figure out a way to change this apocalyptic future. (Source: ANN)
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