"Heaven's Door" starts off with rugged Katsuhito Aoyama (Tomoya Nagase) getting canned from his job as a car mechanic. While leaving work, he suffers from a migraine that causes him to nearly pass out. Katsuhito then visits the hospital to receive some ultra-heavy news: the cause of his migraines is an inoperable brain tumor the size of a human fist that will likely take his life in the next couple of days.
