Mitsuna

Mitsuna 

Mitsuna is a tachi, Katana made to replicate one of the five legendary swords, Yasutsuna. It was theorize as a blade that was near to be the exact carbon copy of Yasutsuna. However, no one has seen this theory being proven as Mitsuna was only used in a battle once. Mitsuna's first battle was witness by only three individuals: The wielder of Mitsuna, the foe and an observer. According to the observer, the battle lasted only a couple of seconds, if not an instant. 

It was named after its creator "Mitsuna". The sword's full name was Oger Cutter - Mitsuna. The Oger Cutter - Mitsuna is rumoured to be held in a shrine inside a mountain in Kyoto. However, Its specific location is currently unknown.

While it was named "Oger Cutter", The Oger Cutter - Mitsuna has only been used to kill one human.

A theory says that it was a gift from Mitsuna to her husband who was part of the army. Others hypothesize it as an order from a certain genius swordsman of a certain group in Kyoto.

It was created during the years between 1865 - 1870.

While there are not much records of the sword in battle, the Oger Cutter - Mitsuna was appropriately ranked as an Anti-Demon Weapon. (It probably gained its rank through its name)