She does not belong to this world, but she exists, truly exists. When she meets a mysterious girl, the wheel of fate begins to turn. Suffering the disaster of destroying the family, being betrayed and seriously injured, happiness is gone forever. Thus begins... The fate of the protagonists has been doomed from the beginning, who can change it? Anyone can--that's what the girl said, her identity is... And what does it have to do with her? Protect her and help her in this way, even at the expense of yourself...