Kyoko became Shingo's older sister after her parents remarried.She ends up living alone with Shingo in place of her parents who are traveling abroad.Kyoko is a slut who hides her sexual desires in front of her brother, but is desperate to get pregnant.Kyoko becomes lustful for Shingo while they are living together, so she plans to have sex with him by making him drink an aphrodisiac.Furthermore, he makes Shingo's friend drink an aphrodisiac and seduces them...
