Gekijouban Gensou Maden Saiyuuki: Requiem - Erabarezaru Mono e no Chinkonka
Sanzo saves a girl from a shikigami.
As a sign of gratitude, she invites our heroes to her place - which is a huge mansion where she lives alone.
Unaware of anything unusual about the place, the 4 enter to stay for the night. However, the master of the castle puts his plans into motion...
(based on description from AnimeNfo.com)
Info: Movie, on air from 18.08.2001