Strange World: Grimoire

A teenager is diagnosed as terminally ill and given only seven days to live. As he goes to sleep, he travels to a fantasy world where magic, the strange, and absurdity reign. There's a legend in Strange World, one of an artifact that can grant a single wish. Taking on the persona of 'Magna', the teen goes on a journey to find the artifact. But there's another legend, to make the wish you must make a great and terrible sacrifice.