Harusame

Harusame (春雨) was the personal katana of Amidamaru and later the main medium used for Over Soul by Asakura Yoh.

About
Harusame is a katana with a hilt wrapped in red cloth and a golden tsuba with indentions at the four corners and crescent markings on the sides of the blade. The scabbard is charcoal-black.

It was the greatest masterpiece created by the Blacksmith Mosuke during the Sengoku Period, when he and Amidamaru were in their boyhood protecting orphans from bandits. With Amidamaru doing the fighting and would often break the blades he used, Mosuke decided to use his late father's cutting knife as the only quality steel he could gain.

It was believed that with Harusame, Amidamaru would never lose a fight and ironically he died fighting the one time he was unable to use it. 600 years later, it was put on a glass case display at a local museum where Mosuke's spirit watched and cry over the rusted katana. This was when Asakura Yoh appeared where he and Oyamada Manta learned about Amidamaru's true history from Mosuke, and voluntarily lent his own spirit to Yoh to repair the blade before passing.

It has twice been broken since. The first time was when the spirit of a bandit Tokageroh, who was killed by Amidamaru, stole it and used it against Amidamaru to get his revenge. After it was repaired again, Yoh never returned it and instead kept it, using it as a medium for his Over Soul with Amidamaru. The second time was when Yoh clashed with the Archangel Michael, and Mosuke was once again summoned to repair it again.

After the Shaman Fight, it somehow came into the possession of Tamamura Tamao who, when she snapped, used it to run amok in Tokyo for three years straight. Tamao would later use it as a medium for her Over Soul with Dai Tengu.

Trivia

 * The name of the blade comes from the time when Amidamaru, touched by Mosuke's work, shed a tear on it and claimed it was a raindrop.
 * It first appeared in Hiroyuki Takei's "Itako no Anna" one-shot where its owner is a hitokiri named "Tojiro".