The long-awaited manga adaptation of The 3rd Internet Novel Award Grand Prize-winning work! There are locks even in other worlds. There are many places where lockpicking skills can be used, such as treasure chests, hidden doors, and prisons in dungeons. Jinroku Kii (Locke), a freelance locksmith, gets recruited from a thieves guild in another world. Locke, who once received training from an expert locksmith, uses his ingrained skills to open the locks of another world! Having made Aira his apprentice, the fox-eared girl from the guild, Locke accepts requests to open locks today.