From the diary of a Japanese soldier who drifted to the island in the past, a part of the island's secret has been revealed. The master of the island was once the silent boy that Sakuya and the others had encountered. Not only does he not grow, but to outsmart the boy who cannot die even when cut, they must destroy the very system of the island to escape!? Torino's devised plan was, in a sense, ruthless. A massive number of monsters, unlike anything seen before, attack the desperate girls trying to escape! Can Sakuya and the others survive?