While vacationing in the Izu peninsula, a high school student Kawashima becomes intrigued by Kaoru, a pretty young dancer in a troupe of travelling performers, and he tags along with them on their journeys.
Sex games by students at a junior high school are exposed by the principal and teachers, but the tables are turned in favor of the students.
Junkichi is the son of a rich landlord, while Koyuki is the daughter of a poor lumber worker. The mismatched pair soon finds love, and against his father's wishes, Junkichi decides to run away with Koyuki to start a new life. But when Junkichi is called off to war, they make a pledge to sing the song of engagement everyday until they are able to reunite
