Charge on Themis: Titan Soldiers.

Misaka Kresen, who became a warrior after rigorous training, was fighting with his friends against a mysterious giant creature that was an enemy of humankind. It was a soldier who defeated giant creatures every day, but giant creatures appear one after another from outside the protective wall. One day, a female giant creature suddenly appeared, and many of its friends died due to its strength. Misaka confronts the female version of the giant creature with all her heart.