@Mizumachi its slowly revealed that Makoto have huge apathy in persons life, the only exception are what he considered close friends and thats why when he lose those on other timelines, killing is just a job to get what he wants.
from what i read its only the elf knight is the other love interest of mc, thats why it dont have a harem tag. maybe if you count his mother then its harem.
man, i read the novel of this and it turns out that the author want to build up a world setting so grand with lame back story for the mc and i just drop it.