When attacked by some college students, you kill all of them except Yūya, who is shocked to see you transform into a beast and battle a lion monster at an abandoned waste facility. These strange people are "Brutes" (Your specie), fighters that have been created to combine the brains of humans and the fangs of beasts. The "Killing Bites" battles have been the decisive turning points in the Japanese economy since ancient times. Your assigned to protect Yūya.

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