If I recall... they're used for the marriage ceremonies because it's one of the holy books in this world... That's probably why, even if so many people have run away...

( There doesn't appear to be anything in them-- at least, nothing obvious-- but getting too close will give Yamanbagiri a sense of strong anxiety. Sakura also comes over to investigate next to him and thankfully, she has a naturally calming presence that should help dispel most of what he's feeling. )

The same flowers were in the bride's room... she even had a bouquet. And the groom... didn't he have a flower pinned to his coat too...?

( And within the flowers, something rustles-- a small moth ayakashi. )