Holy shit. This was one of those really, really niche Vita exclusives that never got the localization treatment, probably due to being a 2016 JP Vita release and it being harder to justify the translation. Degica is bringing it over with a translation on PC!
From Wikipedia:
Hero must die. again on Steam
The hero defeated the demon Guile, but lost his life in the process. Given five more days to put his affairs in order, guide him to the best possible funeral in this anti-RPG where he grows weaker.
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From Wikipedia:
The concept of Hero Must Die was developed by its scenario writer and designer Shoji Masuda based on his experiences of watching his father deteriorate from cirrhosis. The characters were designed by Shunya Yamashita, who both had creative freedom and was asked to adjust many of his designs. The music was composed by Kenji Ito, and was his first time working on a mobile game.