Bubble

The anime Bubble is set in a Tokyo where bubbles have caused a gravitational anomaly, leading to a lawless environment. Hibiki, a skilled parkour practitioner, survives a near-fatal fall thanks to Uta, a girl with unexplained abilities. After their encounter, the pair becomes aware of a distinctive sound, a phenomenon exclusive to them. Uta's involvement in Hibiki's life sets off a chain of events that will have far-reaching consequences for the world.