 If you liked
Dramatic Maestro
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 ...then you might like
Yarichin☆Bitch-bu
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Their stories are so similar, that I'm surprised nobody has made this rec yet. Both manga feature an innocent and naive school boy who is pushed to join a school club. On the surface, this club is like any other club in the school, but only its members know how it really is - it's a gathering of weirdos from all walks of life who crave for one thing - sex. While Yarichin is under publication, Dramatic only has a few chapters translated in English. I also find both manga utter trash, fyi.