Senru no Oni

Senru no Oni was an oni which was accidentally unleashed by a foolish maho-tsukai. It destroyed a Hare village before leaving out of boredom. Usagi Genchi, who lost his entire family in the slaughtered village, tracking the oni down over one-hundred miles before fighting it alone in an unoccupied forest. Genchi was able to slay the monster on his own, but his body was horribly scarred.