A guy and a girl are drawn to one other in a Tokyo where gravity has broken... The narrative is set in Tokyo after the globe was flooded by bubbles that defied gravity's constraints. Tokyo, cut off from the rest of the world, has turned into a playground for a group of young people who have lost their families, serving as a battleground for parkour teams as they leap from building to building. Hibiki, a teenage ace known for his daring style of play, makes a risky move one day and falls into the gravity-defying water. Uta, a girl with unusual abilities, saves his life. The two then hear a strange sound that only they can hear. Why did Hibiki emerge before Uta? Their meeting