Forms Of Obtaining
-Buy at Rengoku village.
-Best way to get is do flower quest and hat quest
-to get to Rengoku village go straight from starter village and you will see it
\-Once u buy go to the leaderboard and press the 3 dots. Once u do that go to the inventory and put it in your hotbar
Note: Katana's are unable to kill demons, because they don't have sun-related materials.