Destiny of Shrine Maiden - Vol. 1 Ch. 4

[MangaDex]

 

[The_FallenAngel]

So that explains why he was so concerned with him. But hm, who is the 8th neck then? We saw everyone but the 8th... Unless, it's Chikane? As the big twist? That'd be tragic, especially for the first incarnation of the priestesses

 

[yuri_witch]

Nooo Oogami! Stay away from our lesbians!