Rukia and Kaien, the Sorrowful Reunion
Rukia talks with Aaroniero Arruruerie, but his faces resembles Kaien Shiba. Aaroniero tells his story how he is Kaien and how he got there after Rukia killed him. Aaroniero then ask Rukia if she would offer her life for the man she killed, Rukia was going to accept it, but refused until she rescued Inoue. Aaroniero, then offers a chance of forgiveness if she kills her friends and brings them to him. Rukia realizing that this Kaien, doesn't seem to be the real one, attacks, him, but is at a disadvantage because Aaroniero trained her and knew her shikais.
Aired 26/12/2007EP 154 - Rukia and Kaien, the Sorrowful Reunion
Bleach
Ichigo Kurosaki is a rather normal high school student apart from the fact he has the ability to see ghosts. This ability never impacted his life in a major way until the day he encounters the Shinigami Kuchiki Rukia, who saves him and his family's lives from a Hollow, a corrupt spirit that devours human souls.
Wounded during the fight against the Hollow, Rukia chooses the only option available to defeat the monster and passes her Shinigami powers to Ichigo. Now forced to act as a substitute until Rukia recovers, Ichigo hunts down the Hollows that plague his town.