A single DVD special for Koutetsu Sangokushi, released in 2008 and also counted as episode 26 of the series. The series it extends is set in a chaotic age of civil war and centers on the Imperial Seal, an ancient relic that grants great power to the warriors it picks. Its lead is the reluctant Rikuson, whose family once guarded the seal before Sonsaku stole it. On his mentor's urging, Rikuson enters Sonsaku's service to find out what the seal truly wants.