Mo-Ruerani (2021)

The owner of an established photo studio, collapses from illness. His son Shinta, who was raised by his divorced wife, comes home. One day, an elderly woman named shows up at the studio and beckons Shinta to come with her. They arrive at a grassy field where Shinta finds about the secret of the "singing voice" that keeps echoing in his memory and about his father's feelings.