Mahou Shoujo Sae Vol.3

Sae, a magical girl, fights alongside Shouko every day to repel "Violators" who come from the otherworldly realm of Eterland. Just the other day, they managed to protect Shirakaba Academy from a Violator named Gizel. But there’s a problem. In the midst of battling these perverted Violators, Sae’s body has been gradually learned sexuality. Until recently, she knew nothing about such things, but now, her body burns with heat in the middle of the night, and she finds herself giving in to masturbation. Still, today brings yet another new enemy. For the sake of protecting peace in the human world, Sae will keep fighting, no matter what! [Translated from the official website]