Based on a science-fiction novel by Asano Atsuko. Plot : The story is set in No. 6, a future model city in 2013. Raised as a top-ranking elite since the age of 2, a boy named Shion lives in an exclusive area in No. 6. On the night of his 12th birthday, he rescues a boy who calls himself Nezumi (Rat). Nezumi ran away from the city's Special Security Area. From that moment on, Shion's life is changed forever. . . Includes episodes 8 and 9, special CD, booklet (8 pages), box designed by toi8 and double sides digipack.