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Shou is a thirteen year old boy that's trying to get his memories back after an accident
Achlys is a demon girl that lives in his head, appeared after a trauma

Shou doesn't know what's his role in the world, but he knows that he HAS to remember what happened during the "accident" before it happens again

Notes:
When Shou's talking, you read // <--- this before the sentence
When Achlys is talking, before the sentence I wrote - <---- this