Soldiers are engaged in training and developing weapons for the fight against the Titans. One day, Izuru is sent from the Public Security Command Bureau and meets Hange who has been researching the ecosystem of the Titans. She is secretly advancing studies on the Titans in her own research lab. Developing an interest in Hange, Izuru infiltrates the lab and learns that a Titan which was successfully captured, is sequestered in there.

Fukushi and Lil are particularly outstanding among the new personnel. Lil’s parents were eaten by the Titans and she has been training every day so that she will be the strongest, in preparation for the inevitable fight against the Titans. Fukushi is attracted to Lil and secretly likes her. One day, the two of them who each have feelings, mingle and a bruising battle starts to develop.