A sword made by Kanehira, a Ko-Bizen swordsmith who was active in the Heian period. The origin of the name "with a long deceased name" is written for the large character of this sword, but it is thought to be a tribute to this famous sword. Known as the best masterpiece of all existing Japanese swords, it is a famous product that can be compared to the "East and West Yokozuna of Japanese swords" alongside the "Dojigiri Yasutsuna". The sword of Terumasa Ikeda, who built Himeji Castle, was introduced to the Ikeda clan, the lord of the Okayama domain, for a long time, but the introduction before the Ikeda clan is completely unknown. It is said that Terumasa Ikeda, the former owner, praised Okanehira as "a famous sword that cannot be replaced by a single country" and treated it as a ritual vessel and displayed it as a treasure sword at annual events throughout the house.