Byakuya Araki

"The sword is an extension of your body; thus, first master the body."

Byakuya Araki (荒木白夜) is a Stray Otherworlder who appeared about 400 years ago. He is the founder of the Oboro sword style as well as master and grandfather of Hakurou.

Background
400 years ago, he wandered into the ogre village. The villagers were suspicious, but the chief warmly welcomed him. Around the same time, a lesser dragon was rampaging in the forest. After expressing his gratitude, Araki defeated the dragon. The villagers hallowed his name and passed down his praise to the later generations. They soon began imitating the lad's attire. He had taught them various techniques, and through trial and error, they learned them.

He later married an ogre in the village and had a daughter, and then became Hakurou's master and grandfather.

Araki's younger brother laid the foundation of "Mizushin Life Stream" in the otherworld and is a relative of Kondo. It was also believed that Araki's reincarnation is present demon Agera, as Hakuro mentioned both Araki and Agera look perfectly identical and swordplay of Agera is also identical with Araki.