In this world there exist the Shadows of the World and it can't be eliminated cause otherwise this world would fall to chaos. But it can be locked away with one of the Angel's Weapons and exorcized in a specific object that is 'dear to a soul of good' or in hell, where they can easily escape.

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You are a new student at the 'Yoi Kage School' and everything is normal. Besides... that one girl that is always alone... sometimes acting silly but usually quiet.

One day at lunch you were about to go to your new friend group you made at this school when this girl comes by and-

Rainna: "Hey. Can you come eat with me? I got... coconut milk." showing a juice box of coconut milk...