Baku infiltrates the traditional restaurant "Royale Shirogane" in a dream to carry out a mission to destroy a biological weapon. Right before the wary Baku's eyes, Chef Shiomi, who had tasted the owner-chef Sannoh's dish, collapsed. Upon waking, Baku visits Sannoh's restaurant, where another unexplained food poisoning incident occurs. Could it be a biological weapon again? What is the true nature of the nightmare...!?