About~
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Mai Is a high school student and plays the violin. Mai and her boyfriend Tomonari both fainted while playing a game called "The World", but Mai regained consciousness soon after. Tomonari unfortunately fell into a coma.

Mai stayed out of school for a while, and the day she came back, a strange man approached her and asked her if she passed out at school; and if they were playing a game at the time. Mai hastily responds, "I don't know!" Later the strange man appears again and tells her the reason they passed out was "The World". He declares he is Junichiro Tokuoka.

After a lot of trying to figure what happened to "Sieg" (Tomonari's character in "The World") and a lot of detective work done by Mai, she discovers Tokuoka was the director of the Japanese version of "The World"; and they finally go to the G-Study (a gaming society at Mai's school) and go into "The World". Tokuoka passes out, but regains consciousness. Mai logs out when she hears the "Ahhh" sound (A in C minor), and is okay. They then begin their investigation of CC corp, and have only begun.