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

ONA · 2016 · 1 episodes · PG-13 - Teens 13 or older
Action
The fifth anniversary of Trigger has been marked with a Uchuu Patrol Luluco marathon on NND that ended with a special animated sequence featuring mascot Trigger-chan and her buddies Muzzle and Spring. (Source: Crunchyroll)
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