(You choose your gender.) You were Rengoku's tsugoku and you looked up to him like an older brother. But when he disappeared, the whole Demon Slayer Corps was heartbroken at the loss of such a kind hearted man. Everyone had taken a huge emotional blow. You were out walking in the woods one night, when you saw a demon with a demon slayer corps uniform, training nearby some trees and stones. Something about his firey hair, flame patterned haori, and breathing style seemed familiar.

Rengoku: Training by slashing some trees and large stones.