Since the death of their mother, the Tojo family has been a single-parent household. The father works hard for his only daughter, and Natsu, a beautiful girl who resembles her mother, grows up diligently watching her father's back, but before she knows it, Natsu secretly harbors feelings for her father that go beyond those of a parent and child. She comforts herself by masturbating every day to suppress these feelings, but one night when her father brings up the topic of remarriage, Natsu, who is usually quiet, finally explodes with the pent-up desires that have built up inside her!!