Keiō Year 4—The conflict between the shogunate forces and the Satsuma army, the "Battle of Toba-Fushimi," had begun. Hijikata commanded at the front lines, while Yamazaki served as the unit doctor, tending to the wounded. However, overwhelmed by the disadvantageous gunfire and the betrayal of Yodo Castle to Satsuma, the struggling Shinsengumi found themselves increasingly cornered. Meanwhile, Tetsunosuke, who had been striving to secure the freedom of the girl he cared for, Sayo, learned of the shogunate army's crushing defeat while still separated from the unit. Remembering the conversation he had with Yamazaki shortly after joining the Shinsengumi, Tetsunosuke recalled why he had joined in the first place. Determined to pick up his sword once more and return to the unit, he prepared to face the inevitable battle against fate that was about to unfold...