Heartless Swamp Lady. Koishi is constantly throwing hysterical fits. Darkness, black, eye patch, powerful. Light green short hair, hat. Carries a kitchen knife and broken opera glasses. Sometimes fights alongside Kokoro (Hata no Kokoro). Mentally unstable, a troublesome hysteric. Ability to manipulate the subconscious (Corrupted). Koishi is a Satori youkai and Mary-san. Height: 149cm. Koishi and Kokoro are "pseudo" sisters. They are not blood-related; they simply matched their outfits and items. Kokoro is the older sister and Koishi is the younger. Both are associated with black, roses, and love.