Is this bait? Literally everyone in the thread agrees that the ending is good, except OP (if you ignore the context of the question and pretend "good ending" means a good way to end the story), who is clearly new.
Maybe I just suck at reading, sorry.
So that's Mado's period blood?
It could just be the last remnant of her in the dream world as she wakes up, like how dreams linger faintly in your memory and then fade away.