Having been raised and trained for the past seventeen years as a traditional samurai "bushi", Yoichi was surprised when his father suddenly announces that there nothing more that he could teach his son, but he arranges for Yoichi to continue training at a dojo owned by one of his fathers friends. So now, Yoichi must leave the tranquility of his remote rural mountain life and move to city to live with his fathers friend's family to continue his studies. And if learning how to cope with city life were not hard enough, he finds himself living with 4 beautiful sisters, and having to endure a "training" regimen more severe than he could ever imagine...