作品主要讲述了某天，一款曾经掀起过大热潮的VRMMORPG「YGGDRASIL」停止了运营。游戏原本会停止一切服务，但过了结束时间后，玩家们却发现不能退出，NPC也产生了各自的思想。现实世界中喜爱电玩的主人公铃木悟（真名）在等待系统强制登出时，与“安兹·乌尔·恭”公会的成员一起意外穿越到了异世界，并且变成了拥有骷髅外表的最强魔法师——“飞鼠”。就这样，真正的奇幻传说正式拉开了帷幕。
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