Lonely Mitamura may be a teacher at the exclusive Sheol Soul School, an academy dedicated to the afterlife, but he has a lot to learn about human emotions and helping others. In fact, his star pupil Tsuru thinks she'll teach him a little lesson by running off during a field trip in the living world. Now, Mitamura has only seven days to track Tsuru down with the help of a brand-new (deceased) sidekick. Will the clock run out before they find her?