Touge Oni: Primal Gods in Ancient Times manga volume 4 features story and art by Kenji Tsurubuchi.

On the journey to see Hitokoto-Nushi again, Ozuno narrates the tragedy that occurred at a shrine on the summit of Mount Katsuragi. Why did the beautiful and benevolent Hitokoto-Nushi go into seclusion? What caused Mount Katsuragi to change? The origin of Ozuno and the party’s journey is finally revealed!