Shinkai (translated by mrdomino as God World) is a cancelled adventure game (?) that was in development by Toei Animation for the Famicom / NES. It seems that players would have took the role of a dead guy, that somehow had to interact with good and evil gods.. or something like that. Sadly there are not many more info on the project, but only a scan and a couple of screens shared online by a japanese website. Even more screenshots were found by Heimao on Twitter.
Thanks to Celine for the contribution!
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