The ninth lord of the Mito clan, Tokugawa Nariaki, was the architect of the Sonnojoui movement in the bakumatsu period, and cleverly helped his son Hitotsubashi Yoshinobu to ascend as Shogun. In his spare time, Rekko produced swords studying under Naoe Sukemasa, his son Suketomo, Ichige Tokurin, and Katsumura Norikatsu. His works generally display a unique yakumo grain and suguha. This piece was produced by Rekko himself with a stylized aoi crest inscribed in the tang. The grain is itame and nagare masame with bright chikei, and yakumo hada visible in the shinogiji. The hamon mixes shallow notare and suguha with kinsuji and nijuba visible, likely influenced by the Yamato tradition. The sayagaki notes that this sword was presented to the Kaga Maeda family.