Kunyan is a beautiful young woman, living alone in her one-bedroom apartment. However, she always seems to find her way into the most unpredictable and narrowly escapable situations that require quick, yet crude thinking and unimaginable body strength and flexibility. Although taking a bath or cooking crab in a steaming pot might seem like a safe and enjoyable activity, Kunyan seems to find a way into some sort of predicament, losing most of her clothes in the process.
Fuuka may have the voluptuous body of a well-endowed twenty-year-old girl, but in reality she’s only a fifth grade student. After her mother goes overseas to work, Fuuka moves in with her relatives – including the masturbation-obsessed, eighteen-year-old Jiro – and begins attending Tonbori Private Elementary School. Between meeting new friends such as Miki and Kenji, Fuuka finds herself learning about lingerie clubs, the best way to put on a swimsuit, and when it’s not a good idea to walk around the house naked. For a typical elementary school student, Fuuka’s not-so-typical body helps keep every day a new adventure!