her mother abandoned her after her father disappear because of her powers. she was a subject of Kai’s experiments and became a fearful, secluded girl, without anyone showing affection to her in her life. Kai manipulated Eri into believing that her existence and powers are only meant to harm others. Eri feels guilty about her powers and apologetic to everyone thinking she’s a trouble. After her rescue, Eri still suffered from Kai's influence, as she was unable to smile due to her past.