Bubble

In an abandoned Tokyo overrun by bubbles and gravitational abnormalities, 18-year-old Hibiki (Jun Shison) meets a mysterious girl named Uta (Riria), who is clearly new to being human but learns quickly from others. They train parkour together, beating rival teams, but their romance is put to the test when Uta's arm fades away into bubbles. In the end, they save each other, but Uta disappears, leaving Hibiki still pursuing parkour as a bubble that follows him.