Ibaraki is the oni or demon who haunts Rashomon Gate. He is an accomplice of Shuten-doji, ruler of the demons, and is known for kidnapping human princesses. Out of protection for the princesses Samurai warrior Watanabe no Tsuna fought Ibaraki and sliced the demons arm off with his sword. Ibaraki used his magical powers to disguise himself as the Watanabe's Aunt Mashiba. Watanabe is tricked into letting Ibaraki into his house allowing the demon to steal back his arm and fly away forever.