One of the most famous and revered katana swords is the Kogarasu Maru. The Kogarasu Maru, meaning "Little Crow," is a legendary katana with a rich history and a strong association with Japanese folklore.

According to legends, the Kogarasu Maru was forged by the renowned swordsmith Amakuni during the Heian period (794-1185). It is said to have been crafted from a fragment of the sun goddess Amaterasu's sword. The sword was originally gifted to the deity at the Ise Grand Shrine and later found its way into the hands of various notable figures throughout history.

The Kogarasu Maru gained fame through its connection to legendary samurai Minamoto no Yorimitsu, also known as Raikō. According to folklore, Raikō used the sword to defeat various mythical creatures and demons during his adventures. The sword's association with Raikō and its mystical origins have contributed to its legendary status.

While the exact physical sword attributed to the Kogarasu Maru may not exist today, its fame and reputation have endured through history and literature. The Kogarasu Maru represents the embodiment of legendary swords in Japanese culture and remains one of the most famous katana swords in the collective imagination of sword enthusiasts and folklore enthusiasts alike.