Futunomitama no Turugi is a red stone sword that has been a treasure of the Asakura Family for many generations. According to Asakura Hao, it was once owned by a sword god and even though it is only made of rock, it is the perfect medium to create a sword oversoul. The sword which slumbers in a storage room of the Asakura Family always creates a stir in the world when it surfaces because its a national treasure.
It was used by Asakura Yohken to kill his ancestor Hao, when he reincarnated into the Patch Tribe. Five hundred years later it was used by Asakura Yoh as a a secondary medium for his Over Soul during the second round of the Shaman Fight. Yoh's son, Hana Asakura would eventually inherit it and used as his main medium for his Over Soul.
After seeing Hana posses it, Yohane Asakura proclaims he does not deserve it and decides to take the Futunomitama no Turugi from him along with his life, but fails and is instead defeated by Hana.
- The Kanji for sword, 剣, is usually spelled Tsurugi in rōmaji, but in the Kang Zeng Bang Shaman Files it is written as Turugi. It is unknown if this is a mistake or intentional.