时间为2138年。曾卷起一大风潮的虚拟现实体感型网络游戏《YGGDRASIL》即将迎来停服。玩家飞鼠在曾经以同伴和荣华自傲的根据地纳萨力克地下大坟墓,独自一人安静等待着那一刻。 但是,不料发生了“过了结束时间却还没有登出”的异常事态。NPC们开始以自己的意志行动,不止如此,纳萨力克之外展开了从未见过的异世界。飞鼠为了寻找过去的同伴,以公会名安兹·乌尔·恭自称,决定在异世界扬名立万。他与宣誓绝对忠诚的部下一同,向新的地域进军。With the events of Re-Estize Kingdom and the Lizard Men behind them, the loyal servants of Nazarick return to their daily routines. Ains, however, is worried about the work/life balance of his NPCs. They work day in and day out without rest.