Kitayama, the eldest son of a wealthy family, attends the same university as his childhood friend Natsuki, who is also from a wealthy family, and they are currently living together. While still a student, Kitayama has effectively inherited one of the companies run by his father, and is engaged to Natsuki. The two were supposed to have a happy Mirai together. Then, one day, some people with a grudge against Kitayama take advantage of Kitayama's absence and kidnap Natsuki. Later, a DVD is delivered to Kitayama, showing Natsuki panting as she is pinned down...