Kogarasu Maru

The Kogarasu Maru (小烏丸; lit. Little Crow) was a double-bladed, curved sword wielded by the Masamune Matsudaira during the Great Samurai World War. It was one of the few double-bladed swords in existence; Masamune was regarded as a master of the unorthodox weapon design. The Kogarasu Maru was designed to be able to channel chakra, as Masamune used it in conjunction with the technique.