在主水之介的决斗中，刀光剑影，勇者无畏。让一个男人睡不腻你

　　When Mondonosuke, a young sword student has a bad dream about his sensei being killed in a duel, he decides to return to Edo to see if he needs help. In the 3 years since he left, he has mastered the secret sword style "Sadanami-giri", that was begun by Sir Ikkaku, who had taken Mondonosuke under his wing after he had been expelled from Master Katakura Ikkansai's Dojo.