Episode 104 Title : "10th Division's Death Struggle! The Release of Hyōrinmaru" | "Shitō jū ban tai! Hyōrinmaru o hanate"
Hitsugaya and Matsumoto, with the help of the 10th division, are pursuing Koga. Koga, whilst apparently not killing anyone, easily takes down several 10th division units before finally meeting and fighting captain Hitsugaya. Hitsugaya quickly overpowers Koga's doll, Dalk, freezing and shattering her. Koga then reveals an axe which he tells Hitsugaya is Dalk's core. Koga, now armed with Dalk's core, then proceeds to fight Hitsugaya. Soon, Koga's body appears to be unable to support the large amount of spirit power he's been absorbing throughout the fight. Koga manages to launch a final attack on Hitsugaya, and Hitsugaya slashes him in the stomach. Koga, dying, then briefly reveals his motives, alluding to "a future without war", before falling to the ground and getting buried in ice previously made by Hitsugaya.