Beastification Syndrome — In a society riddled with a mysterious disease that transforms one's body and mind into a beast, the incurable and unpreventable disease struck fear within people. Those infected are quarantined by the "Ministry of Health" workers.

In this world where becoming a beast means the end of your life, Kazu finds out about his best friend Masa's beastification. Wavering, Kazu makes his decision...
"How much longer, will you remain my best friend?"

The duo's future, torn apart by an unknown disease.