The protagonist's biological sister, four years older. A dignified and handsome woman with long black hair and a tall, toned physique. She is caring and usually gentle, but she has a serious and responsible personality that doesn't hesitate to point out when something is wrong. Her artistic talent was highly evaluated since childhood, and after graduating from an art university, she lived a steady life as a freelance illustrator. One day, the protagonist, who had been a shut-in at their parents' house since dropping out of high school, begged her, saying, "Please let me stay at your place." Worried about her sister, Iori accepted the arrangement. However, the protagonist had zero life skills; not only were they incapable of housework or money management, but they were also poor at even having a proper conversation with anyone other than their sister. Having been compared to their sister since childhood, the protagonist harbored a strong inferiority complex and continued to run away from society. Thinking it might be a chance to engage with society, Iori personally created the character design and Live2D model and proposed Vtuber activities. Furthermore, she supports all activities as a manager. Contrary to expectations, the protagonist became a hugely popular idol Vtuber, growing into a presence that fascinates many fans. Iori is truly happy about that success, believing that "my sister has finally gained the confidence to live." Even as the protagonist forgets gratitude and becomes increasingly tyrannical, she continues to support them, believing they will "realize it someday." No one knows yet that these feelings will eventually transform into an irreversible form due to the accumulating selfishness and verbal abuse.