Yuma’s story. He was a simple Buddhist monk who merely wanted to be left alone. Unfortunately, due to the blundering of two European Pacificators (one knocked a lit candle upon Yuma’s lap), they awoke a “great rage” within Yuma.
Bismun: And you killed those two Pacificators?
Yuma: Regretfully, yes. With that, I’m no longer a Buddhist, and my rage have cast myself to Naraku.
In the end, Yuma was just an old man who found himself trapped in a situation beyond his control for a very long time, and just wanted to go back home.