Bubble

After mysterious bubbles rain across the world and break the laws of gravity, Tokyo becomes an isolated ruin surrounded by gravity-bending water. Young people who lost their families make a home among the abandoned buildings, turning the city into an arena for dangerous parkour battles. Hibiki is one of their best runners, able to leap across the bubbles with unusual skill, but he also hears a strange sound coming from the direction of Tokyo Tower.

When he follows that sound and plunges into the depths, a mysterious girl he names Uta saves his life. She knows little about the world, yet she can hear the same sound as Hibiki. Their meeting connects them to the unanswered mystery behind the bubbles and draws them toward a revelation that could change Tokyo, and the world beyond it.