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Wait, could Kuzunoha be Seimei's mother, like in the legends about him? If so, it's kinda cute and sad at the same time how her grabbing Haruaki's face parallels Mama-aki grabbing his face in chapter 39, given how her own son has been dead for a thousand years and has finally returned to her. Agh, the mysteries are killing me!
Spoilers
Well in a way, since it has been established that despite being Seimei's reincarnation, they are different ppl
If she is that Kuzunoha then yes. Abe no Seime's mother was said to be a fox spirit, dad is human tho
And I have a suspicion that Tensei was related to Kuzunoha, a brother perhaps; and if Kuzunoha were really Seimei's mom, it could be the reason why he wasn't affected by Haru's power despite being a Youkai—maybe? that just my guess.
Darnnn I should have let it marinate longerrr T^T
Actually I read something like few months back about a black fox, becoming a vengeful spirit after being shot by a hunter (the hunter was like a husband I think to the noble/princess the black fox was accompanying before she died) then the black fox was built a shrine and eventually became a guardian deity. If Tensei is that black fox then maybe the reason why Haruaki's mojo doesnt work on him coz Tensei isnt a yokai. Also maybe the reason why Ebisu a God was investigating him. Not sure just a theory as well
Now you mentioned it, I did remember vaguely about that folklore and that just might be it.
After looking at the newest Brutal chapter, I thought the art looked familiar and I was right! Turns out it's the same artist as this manga