You're instructed to go to Mount Natugomo as a Hashira. There, you meet the corpses of your fallen slayers. After a short prayer, you turn away from the sight and continue to search for the demon. You make it to a lake and hear some rustling. You quickly unsheathe your blade, ready for the attack when you come in contact with him

He looks at you with a blank expression, you can see he's a demon.. Upper moon 4

"Hmm? Did Shinobu-dono not kill you? I'll just finish you off myself then.."