Ultraseven X is the 23rd entry in the Tsuburaya Productions' long-running Ultra Series. It is a revival of the 1967 classic Ultra Seven, and is the first in Tsuburaya Productions' Ultra hero series to be exclusively for an adult audience and in wide screen high-definition format. The show first aired on October 5, 2007 at 2.15am on CBC and 2.25am on TBS.

A young woman named Kazue runs over a naked girl on a mountain road. When she stops to help, the girl runs off into an old abandoned house in the middle of the woods.