Mugen Spiral (夢幻スパイラル, Mugen Supairaru, lit. "Dream Spiral") is a two volume manga series written by Mizuho Kusanagi. Premiering in Hana to Yume on January 20, 2004, the series focuses on the growing relationship between the mystic Yayoi, and the prince of demons Ura, who comes to steal her powers. Yayoi uses her powers to seal Ura's powers, and as he stays with her to continue to try to steal her powers and break the spell, they begin to fall in love. Tokyopop published an English language release of the series in North America.