Kossetsu Squad

The Kossetsu (Fractured) Squad, formerly known as the Fu (Negative) Division, is a hidden branch of the Gotei 13. Captain-Commander Yamamoto formed the squad to take care of Hollows appearing in the Soul Society. The members of the Kossetsu Squad are Moeru Jonetsu and Kurai Hono. The squad broke away from the Gotei 13 after becoming Visored.

History
Captain-Commander Yamamoto realized many Hollows were appearing in the Soul Society. He couldn't send any of the Gotei 13 after them, or the Seireitei would be vulnerable. In order to work around his problem, Yamamoto ordered a new squad to be formed. The squad would be hidden from everyone except the First, Second , Fourth , and Twelfth Divisions. The squad would be named the Negative Division.

Yamamoto needed Shinigami to occupy the squad. He asked Suì-Fēng to send anyone she felt could survive fighting masses of Hollows. Suì-Fēng sent two Shinigami, Kurai Hono from the Eleventh Division, and Moeru Jonetsu from the Second Division. Unknown to  Suì-Fēng was that Kurai and Moeru were friends. They happily joined the Negative Division. Yamamoto had barracks built outside of the Seireitei for the new division.

Kurai was made Captain and given her own haori. Moeru was made Lieutenant and given a Lieutenant badge. The Division hunted down countless Hollows. When a Giant Hollow appeared, Kurai and Moeru were almost defeated. Right before dying, the Giant Hollow called to another Hollow. As the Hollow emerged from Hueco Mundo, Moeru jumped through its rip to Hueco Mundo, followed by Kurai.

Hueco Mundo
Once in Hueco Mundo, Moeru and Kurai were seperated. Moeru fell through the sands into the Menos Forest, while Kurai was stuck above, later finding a way down to find her Lieutenant.