One summer day, a group of sixth-grade boys have an argument about whether fireworks are round or flat when viewed from different angles and embark on a journey for the answer during the annual firework festival. Meanwhile, one of their classmates, Nazuna, is troubled by her parents' separation and decides to choose one of the boys to run away with.

Ryuzaki, an editor of Muscle Magazine, which features photographs of men with sculpted bodies, becomes involved with a man named Kitami; their affair soon becomes dominated by sadomasochistic games, with a horrid result. Jump ahead one year, Ryuzaki is released from jail and goes in search of Kitami, perhaps to make amends.