 If you liked
Isekai wa Smartphone to Tomo ni.
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 ...then you might like
Shijou Saikyou no Daimaou, Murabito A ni Tensei suru
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-Both stories involve an overpowered MC,
-Both stories have the MC surrounded by girl companions
-Both stories are consisting of pretty much no negativity, except a little to make the show interesting
-Both stories are cute
-Both stories are consensual and wholesome polygamy romance.
Note that both stories are definitely not for those who don't like non-novel plots, or not very strong logics.