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Voiced by Kanami Aizawa, Reiko is Ryuuki's 24-year-old older sister and a genius chemist who has taken care of him since their parents died. Men are not popular because of her simple and dark atmosphere, but she doesn't seem to care. At some point, Reiko realized that she loved her younger brother as a man, not as a family member. To relieve her feelings, she created another personality called and began working as an erotic streamer. The identity is a secret to all except the viewers. Her proper and studious personality created the carefree and lascivious Kirill persona as an outlet for her repressed desires, but it ultimately led to her losing control and using it to realize her incestuous fantasy.

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