In the dungeon city, six-year-old Luka wakes up from a high fever with the memories of 30-year-old company employee, Kawabata Koji. With a cute younger sister Sophie, a beautiful mother, and a kind father, this world isn't so bad... However, his family's inn is barely making ends meet! He'll use his Japanese hospitality to turn it around! With the body of a child and the mind of a 30-year-old, this ordinary boy's heartwarming story of running an inn in another world begins.