Having passed his exams, Keitaro is off to America to study abroad. Months go by, and then a young girl arrives at Hinata house. Her name is Kanako, and not only is she a master of disguise, but 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 Kanako reveals that she is in fact not Keitaro's sister, but his common-law wife! Naru counters with the announcement that she is the young girl with whom Keitaro made a different pact years ago. Just as things are about to get really ugly, who should arrive but our returning hero, Keitaro. Pity the poor guy...
