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Sayonara Eri (Goodbye, Eri)
This is one shot manga by ChainSaw Man Author and have nothing to do with it.Both are work of Fujimoto Tatsuki
With his mother dying, Yuta attempts to capture her last days on his phone. After her death, Yuta 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.