A guy and a girl are drawn to one other in a Tokyo where gravity has broken... The narrative takes place in Tokyo after bubbles that defy gravity rain down on the planet. Tokyo has become a playground for a group of young people who have lost their families, serving as a battlefield for parkour team combat as they leap from building to building. Hibiki, a teenage ace famed for his daring play, makes a risky move one day and falls into the gravity-bending water. Uta, a girl with unusual abilities, saves his life. The couple then hear a distinct sound that only them can hear. Why was Uta introduced before Hibiki? Their meeting