Seven Deadly Sins x Child OC

3,000 years ago, the youngest child and only daughter of the Demon King, Irtis, was kidnapped along with many other demons and used as bait for the Ten Commandments before being killed.
Now, a girl wakes up in the middle of a forest, alone, with absolutely no memory. Join Irtis in her adventures across Britannia where it seems as if almost everyone knows who she is, except she herself.