Teito first met Karu during the Raggs war, when the 07-Ghosts convened to discuss the Pope's treachery by making Teito Pandora's Box. Karu suggested erasing Teito's memories of the Raggs war so that he did not accidentally open Pandora's Box himself. However, after witnessing Teito's courage and willingness to fight, he rescinds his suggestion and decides to put his faith in him, commenting upon his fighting spirit and complimenting Teito's courage with a rare smile.