Woah... I didn't even know that Byoudouin was a real place. Shows how ignorant I am. I thought it was a fictitious place to seal demons and yokai under the lake from Nioh 2 ahaha.
Was wondering why he was carrying the sword with the cutting edge facing towards the ground. Which made me question if the mangaka made a mistake with how swords were worn in the Sengoku era but it's a tachi sword made during the Heian era, which were worn that way.