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I think the panel where he's in the closet is a dead give away that he's dying no pun intented, Think about your biology class there's always some skeleton hiding in the closet and I think the way sakamoto is put into it is some sort of visual parallel to that. Also in media they often tend to joke about having some type of ghost in closet, or classes, and I thinkl that's what Sakamoto represents, and that's why he didn't hate anybody, he didn't have time to do so, since he wanted to enjoy life to its fullest. I really hate the Death theory, but it surprisingly not that far fetched, otherwise why would the author stop this masterpiece even tho the public ask for so much more, and there's definitely endless possibilities for that. It's because he had a vision and wanted to respect it. Also the name of the manga sounds like a cool catchphrase but also as if he was trying to leave a mark on the people around him. It realy ressembles some sort of final confessions similar to: Please don't forget me. You know who I am dont you? I'm Sakamoto.