There is a lot of fighting with Harem or No-Harem. I am 100% sure you will say that pls no harem if you continue to read. But allow me to set it straight.
MC has another life in another world [MHA] where he lived for 22 years without any memories. He has a life there. So, don't say it's not fair to Sarah, since she also did something she shouldn't have done. Anyway, I won't spoil the plot.
But what can MC do? He can't just abandon one life for another and forget about all the girls he loved or fucked in the MHA world. Nor can he forget about his life in DC.
So, leave, instead of saying *no harem* *It's not fair to Sarah*. Or read 15 chs and think from the MC's POV. *How the fuck is it fair to him?*