Ten years ago, the cat demon Subaru Shibuya stole Hengshan's precious rainbow glass beads for fun. When Hengshan discovered that Shibuya had accidentally broken the bead when he arrived, the furious Hengshan disabled Shibuya's magic and could not turn into a human form for ten years.
However, the rainbow glass bead fragments still have energy and flow throughout Jiang Town. Hengshan has no choice but to rely on animal blood to survive in the castle. He waits for the glass beads to appear and takes the opportunity to regain his original strength and avenge his genocidal enemy werewolf Toshio Honma.
The rainbow glass beads were broken into twenty pieces and scattered in the bodies of people in Jiang Town, under the lawns, under the water, etc. Shibuya found one of the fragments in the backyard of Yasuda's house and swallowed it. Using the power of the fragment, he sensed that there was a fragment hidden in Yasuda's body. Forced to return to the original prototype, Shibuya also began to think about capturing the rainbow glass beads.