Genocide Online

This story is set in a Japan that developed a little differently from ours. This is how a Japanese princess relieves her daily stress by using the latest VRMMORPG, and while playing the villain there, the first town turns into whirlpool of chaos. She smashes the underground organization in one hand and aims for a coup. It's literally a playtime diary of a girl who is called "Genocider-san," "Roaming Last Boss," "Lone Player," "Raid Boss," "Ruthless," "Calamity," and such by the players. (Source: Shousetsuka ni Narou, translated)