Yato God’s Shinki, Yukine has the job of acting as his master weapon in the fight aginst the vicious phantoms of the world. While assuming weapon form Yukine takes the form of a katana (later becoming two katanas which Yato dual wields). Once in this form Yato can wield Sekki as it were an ordinary sword, however, both Yato and Yukine must work together in unison to be successful in a fight.
The Anime Accord 