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.

Sakurai Ann, an office worker, has been steadily saving money to move to the U.S. and live freely. When she finally reaches her goal of 5 million yen, her apartment is broken into and all of her money is stolen. She quits her job, cancels her apartment lease, and then discovers that her boyfriend has been with another woman. With no family to rely to, she finds herself living on the brink of homelessness.

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.