Having just ended her five-year relationship, 26-year-old Michiyo Ozawa goes out drinking with her coworkers. She encounters an unfortunate situation when the elevator to her apartment is out of order. With few options, she resorts to asking a nearby household for access to their toilet, where she meets Zenji Oyamada, a tenant who appears to be a somewhat ordinary guy on the surface—until Ozawa notices the mountain of boxes in his room. Oyamada's brother likes sending him these boxes, which contain trinkets from each of his eccentric, rapidly changing hobbies while overseas. Instantly intrigued by the boxes, Ozawa is asked by Oyamada if she would like to open one. As she does so, a heartwarming story about an ordinary couple and the strange boxes they open begins.