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.
Hiromi Igarashi
Shintani Miki (voice)
Tomoe Tamiyasu
Nabi Kitsune (voice)
Keisuke Nakamura
Takahashi Naoto (voice)
Juri Nagatsuma
Takahashi Yui (voice) / Ichimiya Arisa (voice)
Ken Matsukaze
Teacher (voice)
Ajizawa Shin'ya
Mob (voice)
Half a year after Naoto Takahashi's father got remarried, he hasn't gotten used to the new family members: his stepmother, Sachiko, and his new little sister, Yui. One night as he tries to figure out how to smooth things over with his sister, he gets an app to allows him to take over someone else's body.
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