In the year 2020, Aida Asumi is a cheerful high school student who lives a parallel life inside an online fantasy role-playing game called The World R:X. There her user name is Sakuya. While playing together with her classmates Ikuta Iori (user name Tobias) and Etou Eri (user name Mary) inside the game and having an ordinary treasure hunting adventure, they end up caught in an ominous situation. After an unfortunate encounter with an elite guild and a mysterious player named Hermit, Etou loses consciousness and for an unknown reason is unable to wake up.
