A VR headset and a full-dive game mysteriously arrive on Earth. Vesper decides to play and chooses the Villain Path out of habit, unaware that the powers and items obtained inside the game would carry over into real life. But an unknown threat was already closing in on him: someone had returned from the future to kill him before he could destroy the world and become the most infamous villain in history. Online, Vesper was widely known as "ONE" because of the massive destruction he caused whenever he played the villain in popular online games. Thinking the full-dive game called Asthalia was simple, he picked the [VILLAIN] path without knowing he would be forced to follow it literally. That meant murder, kidnapping, brainwashing, manipulation, massacres, genocide, twisting other people's romantic relationships for his own goals, and many other acts that would slowly drag him into mental decay.