Ichigo Kurosaki vs. Gegetsuburi

 is a fight which takes place during the Zanpakutō Rebellion. While originally between Lieutenant Marechiyo Ōmaeda and his Zanpakutō Spirit, it quickly escalates, forcing Ichigo Kurosaki to get involved.

Prelude
Walking with his subordinates at night, Ōmaeda comments upon his task of searching the records to determine if a Zanpakutō called Muramasa existed. Whispering behind his back, his subordinates deny they were talking. Ōmaeda trips over the body of an unconscious Shinigami, dropping his snacks in the process. Running over to assist him, his subordinates ask if he is alright. .

Getting up, he realizes the area surrounding them is littered with the bodies of fallen Shinigami. As Ōmaeda wonders what occurred here, his subordinates, yelling out, are thrown across the area. As he looks up, two Zanpakutō Spirits comment upon their easy victory. Approaching one of them, Ōmaeda realizes he is Gegetsuburi. They get along well until they comment upon each other's physical features.

Battle
As the two, drawing their swords, prepare to fight, Gegetsuburi tells Hōzukimaru to stay out of his way, and Hōzukimaru, agreeing, states he does not interfere with the fights of others. As they are about to clash, Ōmaeda is knocked away by a chunk of rock. Appearing through a hole in the wall, Ichigo and 11th Division 3rd Seat Ikkaku Madarame realize they knocked out the wrong one. Reassuring him, Ikkaku states no one cares because it is just Ōmaeda.

Stumbling into the clearing, Ikkaku is attacked by Hōzukimaru, who confirms he is Ikkaku's Zanpakutō. As they fight, Ichigo is surrounded by a dense mist. As Gegetsuburi hurls his mace at him, Ichigo, deftly avoiding it, appears on top of a nearby tree. As the Zanpakutō continually throws the mace at him, Ichigo tells him to fight like a man, prompting Gegetsuburi to state his master is a member of the Onmitsukidō.

When Gegetsuburi throws his mace at Ichigo once more, Ichigo deflects it back at Gegetsuburi with a Getsuga Tenshō. The strength of the blast causes him to become temporarily disorientated before he is hit in the face with his own weapon, sending him hurtling into a nearby building.

Aftermath
After the Zanpakutō retreat, Gegetsuburi is found by several Shinigami and taken to the Shinigami Research and Development Institute, where he is destroyed by Captain Mayuri Kurotsuchi of the 12th Division.