Having passed his exams, Keitaro is off to America to study abroad. Months go by, until a young girl arrives at Hinata house. Her name is Kanako, and not only is she a master of disguise, but also she claims to be Keitaro's younger sister and the new manager of Hinata to boot! When this usurper announces plans to change the dorm into an inn with the girls as her employees, it's all out war. And, what at first had appeared to be an unhealthy obsession becomes something much more threatening when...