My World Is Starting to Go Wrong

"It turns out it's not that [possession]'s ability is improper, but that I'm improper??" Yi Wen always thought that the [possession] he obtained was a tool to spy on young ladies, but it wasn't until he actually used this ability on a female classmate that he discovered the girl's secret... She is actually a knight of the night, so heroic. She can also hold a sniper with one hand and shoot headshots with her rifle. She can even fight monsters with a two-handed sword that is taller than herself. Yi Wen admitted that his worldview had collapsed. He clearly had not traveled through time, but why did the world begin to change in style?