Is Brothers Conflict: Setsubou hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2014 · 1 episodes · PG-13 - Teens 13 or older
Reverse Harem, Romance
Ema finds a special lamp that her father left for her. Ema and the brothers rub the lamp to find that something peculiar happens in front of them. (Source: ANN)
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