Legend of Ogre(2003)

Original title: Kijo Densetsu

When a teacher takes two students to a remote village to learn more about the fabled ogre who once rescued the town from a ferocious dragon, they get more than they bargained for in this Japanese spine-tingler. After ignoring a bizarre elderly woman who cautions them to heed the curse surrounding the legend, they open a mysterious door that unleashes unimaginable horrors, and their field trip becomes a living nightmare.