Kouya ni Kemono Doukokusu

From Izumo no Ryuu: A boy, with a virus which unlocks the primal beast, desires forgotten memories. After waking up, Mikado Shuhei found himself locked in a cage in a mysterious medical facility. Without his memories Shuhei now has to fight against beasts who can speak like humans. A woman calling herself Akashi Maya then rescued him from this predicament.