After falling unconscious from a strange noise while immersed in the MMORPG 'The World', Minase Mai and her friend Tomonari Kasumi find themselves in a real-world hospital, with Kasumi trapped in a deep coma. As Mai recovers, she learns from Tokuoka Junichiro, the game's creator, that several other players nationwide have suffered a similar fate. Determined to unravel the mysteries behind 'The World', the enigmatic sound haunting Mai, and the alarming comas, Mai, Junichiro, and their companions embark on a quest to uncover the truth and prevent further tragedies.