Makoto Sakura, 16 years old. She was expelled from high school and there is no place for her anymore, but a relic suddenly appears in front of him. On that day, "dungeons" appeared all over the world. A level system appears in humans, completely overturning previous values. Amidst such changes, Makoto finds her place in the dungeon. Acquiring the cheat skills [experience value x1000] and [level free], he reaches level 10000 and explores the dungeon as the strongest "player"!