Yuria, a newly graduated caregiver, is taking care of an elderly man named Inosuke for the first time, who lives with his daughter Masako. When Inosuke complains that he wants to see his grandchild, Masako brushes him off... Upon learning of the feud between father and daughter, Yuria enthusiastically volunteers to play the role of grandchild, saying, "If you're okay with me, I'll be Inosuke's granddaughter!" However, Masako gives Yuria a twisted look! Due to Masako's trap, Yuria destroys Inosuke's glasses. In a fit of rage, Inosuke spanks and licks Yuria! Masako's plot is just the beginning, and Yuria gradually becomes sexually developed as she receives Inosuke's obscene punishments at every opportunity...