"Travel Agency"—an expert organization that supports people who dream of traveling to foreign lands or unexplored regions in a world overrun by ferocious monsters known as "phantom beasts." Eugene, a young man who had spent much of his life confined to a hospital, finally ventures out into the world after 10 years in search of his missing sister. However, what he encounters is... an absurdly reckless and chaotic "Travel Agency" that turns everything upside down!