少年•相川渦波在異世界一座宛如遊戲般的地下迷宮中甦醒，並獲得了特殊的以及會吞噬情感的技能【???】。在被神秘少女•拉絲緹婭拉所救後來到地上，聽說——只要抵達迷宮最深處便能『實現任何願望』。於是，孑然一身的少年雖然內心並不堅強，但為了回到原來的世界，與病弱的妹妹陽滝團聚而決定探索迷宮。
期間，相川渦波與自稱『劍士』但擁有超強魔力的緹亞組隊，卻在迷宮中遇到了遊蕩的守護者緹達——『暗之理的盜竊者』？！——「此行在外，有所趕工，招待多有不周。不過你們大可將這為火焰所桎梏的空間視作二十層。那麼兩位，就請接受我這『第二十之試煉』吧。」
這是一部有很多伏筆的作品——相川渦波只是個普通人嗎？少女拉絲緹婭拉是何方神聖？明明是女孩的緹亞為何自稱『少年』？『守護者』們也有各自的留戀和目的嗎？歡迎大家結合卷尾的『附錄小說』，一探究竟！
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