Tsundere Inran Shoujo Sukumi

One day, when Yui-kun was walking through the hallway of the school locker room, he heard strange noises coming from one of the rooms. He became curious, and he discovered his classmate Sukumi-chan, who was busy with something unusual in the women's locker room. He was surprised by her openness and ease. But before Yui could think about what was going on, he was caught off guard.