Why is no one talking abt this?? (Ch 75)

(When yashiro and kou entered the red house) Who is this....? I mean if it's significant and prominent to the plot... my guess would be amane But I suppose if not it can be any of the other residents of the red house who mysteriously died maybe as sacrifices to the entity?? What do y'all think?

(When yashiro and kou entered the red house) Who is this....? I mean if it's significant and prominent to the plot... my guess would be amane But I suppose if not it can be any of the other residents of the red house who mysteriously died maybe as sacrifices to the entity?? What do y'all think?