At Kosmo, a serious illness that kept her in the hospital since she was a little girl. Since the blood group is rarely found, it is impossible to find a donor. While Kosmo is on the verge of death, in the city of the 99th generation Miko, chemical and herself, falls into a terrible accident, trying to save the child. It was urgently delivered to the hospital, and there her fate intersects the fate of Rosumo. When the hospital discovers that chemical has the same rare blood group, which is a cosmo, they decide to make it a donor, as chemically will surely die as a result of the accident. , The cososume recites and returns to Tokyo, but then it discovers that the blood is chemical - not the only thing that flows inside it ...