The last Sword Warrior of the Second Unit, Tsurumaru Kuninaga, appears from the time-space distortion onto the warship occupied by the Time Retrograde Army. After saving Yagen, Tsurumaru meets up with Izuminokami and Mutsunokami to defeat the Time Retrograde Army and take back the warship.

Meanwhile, as Ootachi overpowers Tonbokiri and Horikawa, they desperately try to protect the meeting from being uninterrupted. Things get worse when another warship bombards Edo and engulfs the town in flames. The Second Unit is now forced into a corner…