Library

Five years ago, a bubble rain fell on the world, causing abnormalities in the earth's gravity field. Tokyo fell into a vast ocean and gradually turned into a ruin-like existence. A group of homeless teenagers are having a parkour battle among abandoned buildings. Hibiki, the ace player of the parkour team "Blue Flame", can flexibly shuttle through bubbles floating in the air, and often hears singing that others cannot hear. The source of the singing is Tokyo Tower. During an operation to climb an iron tower, Hibiki accidentally slipped and fell into the gravity-twisted sea, and was rescued by a girl of unknown origin, Song. Hibiki discovered that Ge could also hear that unique singing voice. Why did she appear in front of him? In Tokyo, where gravity no longer exists, a boy and a girl fall in love with each other, and then uncover the truth that can change the world.