Jean Grey had grown up in a world where mutants existed. They were every bit as human as anyone, but they possessed a unique genetic trait commonly called the X-gene, and it caused their development of superhuman abilities that manifested at a young age.
After unfortunate events of caused by a space mission gone wrong, Jean Grey was possessed by an incredibly powerful and volatile cosmic force. Unwillingly and accidentally hurting people she cared about in the process, Jean was filled with remorse and an incredible amount of guilt.
In order to save her family and b the rest of the world from herself and the power within her, Jean sacrificed herself and died in a burst of energy in the form of a phoenix.
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In the 21st century, mutants were hated, feared and despised collectively by humanity for no other reason than that they are mutants. The humans didn't know that in a couple of hundreds years time into the future, the world would become a superhuman society, and more than 80% of the world's population would have some kind of special trait. Although the mutations were now called "Quirks".
Akano Yumi was a completely normal young girl (as normal as one could be in a superhuman society), beloved by her family and friends. Thought to be quirkless for a time, Yumi's powers awakened after a horrible incident. A quirk wasn't the only thing she'd gained that day, with it came memories of her past life.
Follow Akano Yumi in her journey of self redemption and path to becoming a true hero!
Reincarnated! Jean Grey x Multiple
Ps. You don't have to be an X-men or Marvel fan to read, I explain everything regarding Jean's past