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The protagonist's fraternal twin, his younger twin sister―― purportedly, but she's actually not blood related at all. Not an adopted little sister but a fake little sister. Second year student at Mikakino Academy. Caused by a certain incident in her early childhood, Kazuharu and her have been deceiving the world that they're older brother and younger sister until now, living together just the two of them.

Unlike her big brother, she's popular and even serves as student council president. However, that's thoroughly external, and her true self is a brocon little sister who loves her big brother to an abnormal degree. At home when it's just her and Kazuharu, she does everything possible, aiming and vigilantly waiting for the right time to seduce her big brother and create a fait accompli.

Like Kazuharu, this world is an unfeeling wasteland, and to this point in the process of growing up she's experienced many hardships with Kazuharu, so she's also wise to the world. And, she adores Kazuharu, who protected her until now, and at home she has no hesitation in declaring, ＂To repay this favor I'll give you my virginity and my life＂. She is a beautiful girl with a cool atmosphere whose straight, long black hair is distinctive.