If you liked
Umi no Misaki
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...then you might like
Shounen yo Taishi wo dake!
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These two both feature an MC that’s having sex with many girls without cheating or making drama out of it. Which is really refreshing considering how prominent that trope is. Umi no Misaki is more of a traditional harem manga (without the beta MC), and Shounen yo is more of a coming of age story, but they neatly fill a niche that few series actually venture into.