In an uninhabited abandoned site, Nomoto witnessed a mysterious girl Hitomi transforming into a wild beast and engaging in a life-and-death battle with a lion monster. Their true identities are beast fighters who possess both human brains and wild beast fangs. Moreover, Hitomi is a beast fighter honey badger who hides the strongest fighting instinct. The beast fighters are hired by the four major financial groups that have dominated the Japanese economy since ancient times, Sanmon, Baling, Kakukyo, and Ishida, and fight as their agents for hegemony. Later, Nomoto met Hitomi again and was involved in the fierce battle of these beast fighters.