2022年天才程式設計師茅場晶彥開發了世界第一款完全潛行專用裝置「NERvGear」。那創新改革的機器為VR（虛擬實境）世界帶來了無限的可能性，而四年後……仿佛為了與「NERvGear」後續的VR裝置「AmuSphere」對抗般，一款新世代可穿戴式裝置開始販售，那就是「Augma」。這款最尖端的機器，取消了完全潛行功能，相對地將AR（擴增實境）功能發揮到極限。「Augma」能在清醒狀態下使用，既方便又安全，轉眼就在玩家之間廣為流傳。吸引人使用的軟體是一款名為「OrdinalScale（OS）」的「Augma」專用ARMMORPG遊戲。桐人也打算參戰亞絲娜等人在玩的那款遊戲，然而……
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