 If you liked
One Punch-Man
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 ...then you might like
Sentou Hakai Gakuen Dangerous
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SHGD is the nasty little brother of OPM. Similar but cruder humor, similar superpowers, but with a storyline that reeks of drugs. Actually SHGD contains very little fan service as well (even if the plot is very sex-centered), so that's a similarity as well. And oh they're both extremely funny.