Ancient relationships and rivalries of the Goko clan continue to wreak havoc in the Taisho era while Mao and Nanoka pursue a mysterious doctor who violates the modern directive to "first do no harm." The story of how Mao came to apprentice at the Goko dojo is revealed, as is a surprising secret about his former best friend and senior apprentice Daigo. Back in the nineteenth century, our friends finally discover the location of Shiranui's lair...and a long-lost love!