God is a being who serves above the angels in Heaven.

Source: Platinum End Wiki

When life becomes too much for Mirai to bear and attempts taking his own life, he’s saved by Nasse, a guardian angel who offers him a chance at becoming the new god. To do so, he must face off against 12 other candidates within 999 days. Mirai, who was once at rock bottom, now finds himself with supernatural powers in a battle royale for the highest title.
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(Source: Funimation)

[Wiki (jp)](https://ja.wikipedia.org/wiki/屋良有作)

As his classmates celebrate their middle school graduation, troubled Mirai is mired in darkness. But his battle is just beginning when he receives some salvation from above in the form of an angel. Now Mirai is pitted against 12 other chosen humans in a battle in which the winner becomes the next god of the world. Mirai has an angel in his corner, but he may need to become a devil to survive.
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(Source: Viz Media)

Oita Kami