Total Recommendations: 1
If you liked
Ichiban Ushiro no Daimaou
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...then you might like
Campione! Matsurowanu Kamigami to Kamigoroshi no Maou
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Both protagonists are "Demon Kings", without any intention of being them from the beginning. Both have been surrounded with many girls, a harem basically. Both have fighting scenes with fan service scenes in both.