SPOILER ALERT

I actually have a 2 theory why “hikaru” don’t want Yoshiki to be sad and can feel the feelings and emotions of a human



1st: maybe because “it” was a human or used to be I can say and maybe we all know that from Japanese Mythology that a humab feelings can create a “Deity” or a “Kami” to worship. So maybe “it” was one of the many sacrifices or “it” could be first sacrifice (it was pretty common practised back in the day) and it harbours resentments towards the people who sacrifice “it” and gather the anger and hatred around the villages and eventually became a Deity

2nd: when Hikaru was dying on that very mountain where “it” resides, he made that wish saying “I don’t want to make people sad especially Yoshiki I don’t want him to be sad” so we can say that “it” grant his wish that’s why he can feel only sympathetic only towards Yoshiki and the sacrifice were his head/body

I actually have more theory, when Yoshiki put his hand inside of “it” he saw a glimpse of memory about the wife and the young head of the family, that’s the moment where the young head of the family made the wish and his wife “came back” to life but died painfully on the same night of that day, either because a head can’t actually live as it don’t have a body because at Hikaru’s case, he offered his body (he didn’t actually said it but maybe “it” just took it since he didn’t say he’ll offer something in return) so that’s the reason why “Hikaru” came back and since “it” can’t actually bring back the dead “it use ”it” “spirit” to make it “alive” OR, the wife never actually came back to life instead just a delusion of the young head of the family and thinks that enough sacrifices can actually make his wife back so he killed the people around the village and sacrificed it and passed down the head of his wife like some heirloom thinking someday one day she’ll be back to life again and because of that like what I said earlier, the hatred of the sacrifices made “it”