 If you liked
Hachi-nan tte, Sore wa Nai deshou!
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 ...then you might like
Isekai wa Smartphone to Tomo ni.
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actually very similar to smartphone.
Reincarnated and due to typical isekai MC op-ness gets put in position of power and builds his kingdom/territory. This guy looks like he wont stop adding to his harem unlike smartphone who stops at like 7 or 8, I forget. Didn't know there was a contest for biggest harem.