Mitsuo Hayama, who is preparing for his entrance examinations, secretly plans to take a trip with his classmate Akira, alone and undisturbed. Noriko learns of the trip by chance and tells Mitsuo and his friends that she will join them, and they reluctantly agree. However, on the day of the trip, Akira suddenly decides not to join. Mitsuo and Noriko, a man and a woman, begin their journey together.