Kaien Shiba (志波 海燕, Shiba Kaien) is the former Lieutenant and later Captain of the 13th Division in the Gotei 13, hailing from an alternate world, which was laid to ruin jointly by the Collapse and Averian's army. He was the only one, alongside Nanashi Hiroshi, to survive the final battle in his world, joining the latter in his journey to alter their worlds future at the behest of their worlds Garian Shinjo. Immediately following his arrival in the new world Kaien encountered Itazura Kori and, after some time recuperating, joined the latter as a member of the Blades of Night's Veil.