Their introverted son finally brought a friend home. Turns out, his friend, Shunya, is a top student, well-respected by his teachers, and a popular figure in class. Overjoyed that her son made such a great friend, Serino warmly welcomes Shunya. However, Shunya's true intentions are set on Serino's body. Having been attracted to Serino's beauty for some time, Shunya first gains the son's trust, and eventually, he makes his move. Unaware of his true intentions, Serino, completely fooled by his charm, finds herself overwhelmed by a surge of lust...