High school student from Nanao, Ishikawa Prefecture, Ganta Nakami is unable to sleep due to insomnia, and suffers from headaches and drowsiness at school, making him moody and causing his classmates to shun him.

One day, Ganta enters the observatory and meets his classmate Isaki Magari, who also suffers from insomnia and sleeps in the observation room.

Ganta feels at home at the observatory and tries to revive the disbanded astronomy club so that it can continue to be used.

Ganta bows to Isaki's mother, asking her to give him the photo that won him the prize in the contest.

The stargazing party is a success, Isaki is safely discharged from the hospital, and the two of them have a bright high school life.