Gilts Seeds, which amplify human desires and transform people into monsters, were scattered, but they were recovered thanks to the efforts of Haruno Aikawa and Fuyuka Sugawara. A brief period of peace seemed to have arrived, but suddenly a portal to another world opened, and Haruno and Fuyuka were swallowed into it. Later, when monsters appeared, Natsume Osumi and Chiaki Shibajima transformed into Extias and fought against them.