On March, second year of Meiji, the New Government Army prepares to send an ironclad warship called the CSS Stonewall after the Republic of Ezo conquered Goryōkaku. Three months earlier, Shiranui, Kakashi and Zagashira are surprised when Kobako and Benimaru find bullets at Hakodate Port, hinting that Ezo might soon turn into a battlefield. At Toukei Castle, Lord Shoten and Tatewaki visit Katsu and Saigo, asking them to have someone take Yojiro to Ezo. During his travels, Yojiro meets Ryōsuke Kuroda, who invites him to join the CSS Stonewall...