Isane Kotetsu is the lieutenant of the 4th Division of 1 3 Court Guard Squads. She is the older sister of Kiyone Kotetsu . Unlike her younger sister, Isane is generally quiet and observant, though she does share her sister's sense of loyalty to her captain.
Isane's zanpakuto is Itegumo . When released, two smaller blades protrude from Itegumo's hilt at 45° angles. Its special abilities, if any, remain unknown.