With the goal of securing 2 billion yen for a carefree retirement, a young woman finds herself accompanied by an adorable companion. After a tragic incident claims her family, eighteen-year-old Mitsuha Yamano faces the daunting challenges of the world alone. Lost and uncertain about her future, she receives a mysterious gift from an unknown being—the ability to traverse different dimensions. How will she utilize this newfound power? Despite occasional moments of cluelessness, Mitsuha proves to be resilient and resourceful. Armed with modern knowledge and tools, she embarks on a journey in a medieval realm, determined to forge her own prosperous path in this fantastical tale of wealth and adventure.