Midori, a village in the middle of a jungle, is fairly equipped with all the necessities people need for a comfortable living. The village is surrounded by huge walls by all sides, no one knows why they were built and who built it. Kariya, a 17 year old boy, curious in nature wants to find the truth. Sets off on a journey outside the wall, into the unknown, al by himself. Will he find what he seeks for? or will he die before he even finds anything? Perhaps he might find out that the village was a testing ground?