Meikyuu Kingdom: Damu Tokushu Butai SAS no Ossan no Isekai Dungeon Survival Manual!
Meikyuu: Labyrinth Kingdom, A Tactical Fantasy World Survival Guide ·迷宮キングダム 特殊部隊SASのおっさんの異世界ダンジョンサバイバルマニュアル!
A veteran soldier named Taiga, after two decades in the military, chooses to return to Japan to find new purpose in life. During his journey, an unusual earthquake at the airport disrupts his travel. Rather than dying, Taiga is transported to Million Dungeon, a complex world filled with caves, magical elements, and various kingdoms, as well as dangerous creatures. To survive, he must establish his own nation. Despite his extensive experience, the challenges he faces may exceed his capabilities.