A young innocent gradually becomes privy to the shady dealings of her father and his free-spirited mistress over the course of one eye opening summer vacation. Kaoru was just getting her footing in life when her mother walked out on her father. Now, as the head of the household attempts to make up for his shortcomings by working overtime at the used car lot and bringing home a Pac-Man machine for the kids, a new woman named Yoko (Yuko Takeuchi in her comeback role) appears in the household. Yoko is the complete opposite of Kaoru's real mother - she feeds the kids a steady diet of junk food while coming and going as she pleases - but there's something about her father's new mistress that fascinates the impressionable young girl. As the summer goes on and Kaoru becomes increasingly aware of her surroundings, she begins to mature in ways that can only happen when you finally learn to roll with life's punches.