Cells at Work! Code Black Vol. 7 (manga)

BEFORE FIRST LIGHT
After years of struggle against the ill health of this body and the despair in its heart, the first glimmers of hope have begun to appear. Could the body finally be taking control of its health and looking to the future? Alas, even amid this turnaround, the costs of the life the body has led are still coming due. In a hidden corner, a copying error occurs, then repeats itself, then repeats itself again. A new, unnoticed threat is getting out of control: Cancer.