Centuries ago, Nerine, Masaki, and Kei were assigned to the Ninth Division in the Gotei Thirteen, shortly after their graduation from Shino Academy. Nerine and Masaki managed to attain the 5th and 4th Seats respectively while Kei served as the 3rd Seat. However, Nerine, Masaki, and Kei were framed for the murder of Yukio Hoshimitsu by their sworn Blood brother, Ninth Division Vice-Captain Shuten Tamane and were forced to flee to the Human World after Shuten tried to kill and absorb Kei's essence for his own gain. Disowned by their respective Branch Families, Nerine and Masaki loyally followed Kei to exile, living out a nomadic lifestyle while the trio eluded numerous Gotei Hunter Squads in the process.