直人はふとしたことから手に入れた肉体憑依アプリで他人の身体に乗り移れるようになった。クラスメイトの美貴に彼女の友人アリサの胸をガン見していた事を怒られた腹いせに、「予約した時間に対象へ憑依できる」新機能を使って美貴に憑依する。顔を隠しつつも制服をはだけて胸や股間をＨに自撮りし、女の子の身体でおしっこ体験と、やりたい放題！ さらに巨乳のアリサへも憑依するが、一見大人しそうな彼女は夜のお店で男達の性欲処理の仕事をしており、バニーガール姿でＨされてしまうことに！？
Naoto is an ordinary guy who, after his mother's death and his father's remarriage, has two beautiful women enter his life–Sachiko, his stepmother, and Yui, his stepsister. However, as the days go by, Naoto begins to worry about Yui's emotional distance from him. One day, he glances at his phone to find a miraculous app that promises to aid its user in understanding the person of their choice. Attempting to better understand Yui, he tries the app on her at once and surprisingly possesses her body! Thoroughly bewildered, Naoto returns to Yui's room only to see her reflection in a full-length mirror. He becomes unable to suppress his urges, and feelings of lust for his sister's body erupt forth. In his uncontrollable sexual desire, Naoto plays with Yui's receptive breasts and erect nipples then delights in the pleasures of an inexperienced woman.
