After Awakening, the Game NPC Became the World's Ruler

She's an utterly ordinary high school girl. Her biggest worry every day is doing practice problems and getting into college. There's just one strange thing about her school: students often vanish for no apparent reason. The school is full of terrifying urban legends. But she's been studying there for three years and has always been safe. That is, until one day she sees her best friend die in one of the school's ghost stories. Only then does she realize that terror has arrived. This is a world of horror games, and her friends, classmates, teachers, and school staff are all players. To the locals, the players are the very embodiment of terror. She finds a device that connects to the game. [New player, would you like to enter the game?] [Yes] She chooses yes, transforming from an NPC into a player with an identity. She will drive the players out of her world and become its new ruler. Theme: Persevere and keep striving