|User||Ichigen Miwa (former)|
|Anime Debut||Episode 1|
|Manga Debut||Chapter 1 (K: Stray Dog Story)|
It is a katana with black tsuka ito weave with an ornate silver same under the cord, and a bronze kashira. It has a black tsuba with a normal steel blade; the scabbard is dark blue and has a bronze tip that matches the kashira.
It is formerly the weapon of the late Colorless King, Ichigen Miwa. However, prior to his death, it was sealed deep under the lake guarded by a giant.
The true extent of its power it's unknown, however it seems to be able to bypass the Silver King's power of inviolability.