Goodbye, Eri(2022)

Sayonara Eri

With his mother dying, Yuuta attempts to capture her last days on his phone. After her death, Yuuta heads to the roof of the hospital to commit suicide, but a meeting with a strange girl leads him on the path to making a movie.

(Source: Manga Plus)

Note: The one-shot was compiled in a special volume, released on July 4, 2022.