Hiramekarei

Name: Hiramekarei (ヒラメカレイ)
Wielder: Chōjūrō
Debut (Manga): Chapter 454

Hiramekarei is a double-handled sword, linked together at the handles by a chain, wielded by Chōjūrō. The Hiramekarei has two holes in the upper end of the blade that shoot out chakra, which can seemingly be formed into weapons such as a hammer. However, it is apparently heavy, as Chōjūrō tires easily from carrying it.

Trivia

Both hirame and karei are Japanese names for species of flounders. The flounders with their eyes on the left side of their body are called hirame (鮃, 平目, 比目魚), while those with their eyes on the right side are called karei (鰈). Befitting its name, Hiramekarei is shaped like a fish, and the name then would mean "The two flounders".
Hirame can also come from hirameku (閃く, "to flash," to flicker). Karei can also mean splendour (華麗).
Hiramekarei is one of two swords of the Seven Swordsmen that is wrapped in bandages, the other being Kisame's Samehada.
Hiramekarei is one of two swords of the Seven Swordsmen having a fish theme, the other being Kisame's Samehada.