 If you liked
Fukushuu wo Koinegau Saikyou Yuusha wa, Yami no Chikara de Senmetsu Musou suru
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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The plot and the beginning reason are different but, want a cool, op main character that dont has any interest in love, woman or anything but still funny and hilarious. Both is dark but one is a comedy with dark things you can only know by notice small details, the other is truly dark, you can regconise without trying, specially that both of our mc is crazy af and love bad guy's blood and a mouth that can punch everyone brain