5x1310th Division's Death Struggle! The Release of Hyourinmaru Episode Summary Aired: Wednesday November 22, 2006
Hitsugaya and Matsumoto, with the help of the 10th division, are pursuing Koga. Koga easily defeats several 10th division units before finally meeting and fighting captain Hitsugaya. Hitsugaya quickly overpowers Koga's doll, Daruku, freezing and shattering her. Koga then reveals an axe which he tells Hitsugaya is Daruku's core. Koga, now armed with Daruku'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, "a future without war", and then falls to the ground, where he gets buried in ice left over from the preceding battle.