Is Blue Archive: Beautiful Day Dreamer hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

ONA · 2022 · 1 episodes · PG-13 - Teens 13 or older
Fantasy, Sports, Video Game
The short centers on the Game Development Department of Millennium Science School, and shows Momoi being roped into various activities as she struggles to come up with ideas for a game's story. (Source: ANN)
View on MyAnimeListShare
Check another title