Whenever an Isekai story goes the harem route it is lost for me.
Why bother reading a slow-paced story if all you get is a bunch of good-for-nothing women swooning over a man to the point where they are willingly sharing him instead of looking for another potential mate[the only woman in this story with a character is another reincarnated Japanese person,gg].
This could as well be the biography of Muhammad, given all the deception, sexual objectification of women, bloody conflict, anti-human atrocities, slavery & slave-raids presented in this story.