The UW chapter of the Sword God Realm was the fourth part of the " Sword God Realm " series. The story took place in the fictional " Sword God Realm " world. The protagonist, Kirito, and the other characters participated in the " Swordsman in Black " plan and went to " Asuna's world ". The " Sword God Realm U " and the " Swordsman in Black " had a fierce battle and met the heroine, Asuna, there. The entire story revolved around the battles and adventures of Kirito and the other characters in the Sword God Territory U. At the same time, it also revealed the truth of the Black-clothed Swordsman plan.