Samurai Harem: v. 5  (English, Paperback, Minamoto Yu)

At the behest of his father, Yoichi Karasuma leaves his small mountain village for the city. There, Yoichi will join the Ikaruga Dojo, which teaches the Ukiha Kamikaze fighting style, and continue his training so that he may one day become a great samurai. However, he runs into two complications. First, his samurai attire and attitude are out of place in the modern world. Secondly, the Ikaruga Dojo is now home to four beautiful sisters, and Ibuki Ikaruga, the eldest, is a fierce warrior who frequently delivers ferocious beatings to Yoichi.