Having been raised and trained for the past seventeen years as a traditional samurai bushi, Karasuma 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 father's friends. So now, Yoichi must leave the tranquillity of his remote rural mountain life and move to the city to live with the family of his father's friend. And if learning how to cope with city life was not hard enough, he finds himself living with four beautiful sisters, having to endure a 'training' regiment more severe than he could ever have imagined.

[Source: AniDB]