After losing everything in the Great Famine, Amelia and Connor immigrated from Ireland to the United States of America in 1849 to find happiness and become rich in California during the Gold Rush period.

Note: It was announced on August 28, 2021 that the manga changed editorials, with the license now being owned by Kodansha instead of Shueisha. From volume 7 and onwards, the series was published by Kodansha physically (On the digital side, the manga had a re-edition made by Kodansha of its first 6 volumes, with the Shueisha digital version being discontinued after the launch of volume 7).