Unabara Domain-home to nightmarishly strong students and masters of martial arts of all kinds. The lord of the Unabara has decided that whichever of his sons discovers the strongest martial arts style will be his heir, but when 28th son Naoyoshi Washizu decides on Ogama-style practitioner Gama Kurogane, son of notorious father and scion of a "weak" style, to represent him, the odds seem bleak. But between Naoyoshi's determination and Gama's hard-earned strength, they may yet come out on top!
Sana, the daughter of the Chiba Dojo (martial art gym) in Okemachi Japan, had promised to marry Ryoma Sakamoto, a TOSA Samurai who was assassinated by an unknown killer at the end of the EDO period. He was once the dojo's headmaster and Sana's brother's best friend. While Sana was in charge of the Dojo when the master was absent, a woman called Ryo, who claimed to be Ryoma's wife before he was killed, appeared before her .... and eventually, Sana became involved in a mystery surrounding Ryoma's assassination.
Kotetsu Miyasaka is a kendo prodigy. While his twin brother, Yayoi, practices the sport, though, he lacks his sibling's skill, enrolling in a different school to try and differentiate himself. When things go wrong at Yayoi's new school, though, Kotetsu finds himself caught up in a potentially life-or-death confrontation -- only to suddenly find himself swept back to Edo period Japan where the stakes are infinitely higher!
Taking in by Souzou Sagara and his roshi band of samurai, Kotetsu must find a way to survive in the past and possibly help shape Japan's future!