Two sleepless teenagers find kinship as they escape to their school's astronomy observatory.

Unable to sleep at night, Ganta Nakami is cranky in class and unpopular with his classmates. He discovers that the school observatory, once used by the now-defunct astronomy club, may be the perfect place for a nap--but he's not alone. Fellow insomniac Isaki Magari is willing to share the observatory with Nakami, and a friendship between the two begins as they bond over the most unlikely things.

Magari and Nakami are preparing for the summer festival, the biggest event in town. The couple watches the festivities from the best seats--Kurashiki Sensei's family home. As midnight falls, Magari, Nakami, and their friends gather for a daring challenge--crossing the seven bridges to fulfill the requirements of a romantic local legend...