Birth, Yuuki, Awakening Yuuki Wakura is a high school student who has had to live on his own after the mysterious disappearance of his sister many years ago. By sheer happenstance, he finds himself within the alternate dimension of Mato, where he is attacked by fearsome creatures called Shuuki. Yuuki is saved 7th squad of Demon Defense Force, led by Kyouka Eden. Kyouka tells her subordinates, Himari, Shushu and Nei, to look for other survivors while she protects Yuuki...