The protagonist, Goto Benio, is the son of the president of his family's delivery service, Magokorobin. He has no complaints about his job as a courier, and in fact hopes to take over the business in the future. However, even though he loves his job as a courier, he is still a high school student. He struggles daily with the demanding work, his sister Hiko's loving reign of terror, and his declining attendance.

Each episode is basically a complete story, and because it's set in a delivery service, there are a lot of supporting characters. Although it's primarily a comedy, the members of Benio and Magokorobin, as well as their friends, are all men and older sisters. There are also some tear-jerking stories that touch on the importance of social trust and human connections.