Mitamura teaches at a school in Sheol, a parallel realm where the souls of the deceased congregate. During an excursion to Earth with one of his students, Tsuru Shimizu, he loses track of her. While searching for her, Mitamura strikes 20-year-old Hanasuke Onigawara with his scooter. Hanasuke recovers from the accident fairly quickly, which is possible only because he had already died the previous day in a head-on collision with a truck. Hanasuke is slow to accept the reality of his death. Sensing an opportunity, Mitamura makes a deal with him: join the search for Shimizu in exchange for the secret of how to be revived. However, time is running out for both of their goals. After seven days, Hanasuke will be sent straight to Sheol, and Mitamura will have to return without Shimizu, consequently losing his job. As the two try all manner of ways to lure Shimizu from hiding, the countdown continues relentlessly.