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Elena and Oshima, a tutor who came in and out frequently as her daughter Miki's exams came to an end, formed a relationship. Miki gradually begins to doubt the relationship between Elena and Oshima, who continue to have a sloppy relationship even though they know it's wrong. One day, Miki, who has witnessed the scene where the two are devouring each other, vents her anger to her mother and leaves the place. Elena, who is left alone, approaches her daughter's boyfriend, Yu, who was there because of her loneliness.