Ultraman Tiga: S1 E16 - The Revived Demon Ultraman Tiga

Legend says that a demon was trapped on Mt. Sukuna back during the Edo period. However, when tomb raiders steal the magic sword from the temple, the Mt. Sukuna demon is resurrected. Daigo sets out to face it when he meets someone in the mountains. The man says his name is Kagetatsu Nishikida and that he is the one who once sealed away the demon!