One of the works by Kiyotaro Kitayama, a pioneer of domestically produced anime films, and his fourth production. According to historical records, the story revolves around "a day in the life of the protagonist, a postbox, and its surroundings," but details remain unclear as the film itself has not survived. During this period, Kitayama focused on producing short animations at an unprecedented pace for the time, releasing approximately one film per month. Consequently, works from this era are said to have shortcomings such as a low number of animation frames and simplistic movements.