Sonoko Nanakura is a third-year high school student who goes on to high school. Since most of her classmates go on to school, she has no doubts and is working hard to study for her exam. On the other hand, Wataru Okouchi goes to the "part-time system" while working. His dream is to work at an observatory like his deceased father, but for Wataru, who lacks tuition fees, even taking a college entrance exam is far away. One day, such two people met. Sonoko, who hurried to leave school, collided with Wataru who had come to school during the regular hours.