Location: February Rares Shop - Game Menu
Price: 50,000 Gold
Sellback: 12,500 Gold
Rarity: Rare Rarity
Base Damage: 27-33
Description: This blade has witnessed much bloodshed over the years but also trained many worthy successors such as Taro the Manslayer.
Note: Oni Katana (鬼刀) means "demon sword" in Japanese.
Thanks to rruurruu77.