One of the Tenka Goken, a tachi by Miiketenta Mitsuyo. The sword was made in a style unlike those of other swords from the same era. Because of this difference in quality, it was regarded a spiritual blade able to cure illnesses if left at someone's bedside.
He carries such strong spiritual power that birds and animals are afraid of him and will not approach. A genuinely treasured son who is usually kept securely in the treasury.