Responses
Don't think so, he looks white haired and fat
In the epilogue Kouki looked a bit chubbier and also had white hair. I assume he died of old age and reunited with the angel in Heaven. Maybe time passes faster in Heaven so the angel didn't expect to see Kouki so soon.
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So in the epilogue, the angel meets kouki. They have a happy reunion. The angel says I did not expect you to come so early. What does this imply? I don't know, did he commit die ?....