An inconspicuous adventurer, Sora Hosaki, returns home from a dungeon in Sapporo's 'Chikaho' only to find his home garage transformed into a dungeon. He discovers a stone tablet-like object at the entrance, possibly a skill board. Using the skill board, he ventures into the dungeon, aiming to become a top-ranked adventurer. However, he unexpectedly ends up wearing a mask and carrying a potato, becoming a suspicious figure. Will he succeed in conquering the dungeon as a 'normal' person? Note: This work is a fictional story unrelated to real-world locations, organizations, or individuals.