Tsukasa has dreamed since childhood of becoming the best samurai to protect everyone he cares about. At the age of seventeen, he was given a katana for the first time and told to beware of a samurai named Rui. There were many rumors about this guy that he was crazy, that he was very dangerous, and naturally, Tsukasa, like a good guy, obeyed and tried not to run into Rui. But one rainy day, cries for help from the most ordinary people were heard in the village, but they did not take long after Rui waved his hand and beheaded a couple of townspeople. Tsukasa froze in shock, he took out his katana and approached the older guy, pointing a weapon at him. "How dare you do that, Rui?!"