Hi,

looking for an isekai series where the MC doesn't struggle with the enemies at all in terms of power, but still goes through some kind of hardship to keep it interesting. Examples of what I'm talking about:

1. Overlord – Ainz can win any fight in the series EZ if he goes 100%, but he still struggles constantly either because of self-imposed restrictions or his lack of leadership skills/confidence
2. One-Punch Man [inb4 not isekai] – you know from the start he's always going to win, but the side characters have interesting development and it's very entertaining and goofy
3. Cautious Hero – he's drastically over-leveled for everything but still treats everything seriously and tryhards, making the fights engaging. Plus the chick is funny af xD

Bonus points if the translation is good; for example Solo Leveling LN has fantastic, idiomatic English, but I'm fine as long as it's not a linguistic abomination.

Necessary requirement: there can be no "cucking" whatsoever involved. I'm fine with romance if it's monogamous. If there is a harem, the MC should either choose one love interest early in the story and stay loyal OR must for some reason choose to not pursue romantic relationships/stall (look Overlord and Cautious Hero again).

I will be very grateful for any suggestions!