Story:
The story is set in Tokyo, after bubbles that broke the laws of gravity rained down upon the world.
Cut off from the outside world, Tokyo has become a playground for a group of young people who have lost their families, acting as a battlefield for parkour team battles as they leap from building to building.
Hibiki, a young ace known for his dangerous play style, makes a reckless move one day and plummets into the gravity-bending sea. His life is saved by Uta, a girl with mysterious powers. The pair then hear a unique sound audible only to them.
Why did Uta appear before Hibiki? Their encounter leads to a revelation that will change the world.
External Link: Official Website