[puppygod]

Originally Posted by Mecha_Trueno

Lots of Maria-san in the second half of ther episode

Spoiler:

(...)
Oh, we did find out something else in this ep... Maria is the Key maker
Watch that cockroach scene again, notice that magic door? When Maria came running out of there, it was just another room. Then when she goes through it again, it leads to outside the House
She must've PLANNED IT! Escaping from cockroach, so "lets use the magic door to get to Hayate-kun." Then afterwards "lets shortcut to outside and cut to where Hayate-kun can trigger the Maria-san flag"... yup, that must be it

Spoiler for reply:

She's Lady of Pain, and Sanzenin mansion is one of her mazes. Actually, that hypothesis would explain a lot of things that happened there...