During a good-natured family trip over the summer holidays to Iceland, the boys of the DonGlees family uncover a buried treasure while exploring hidden coves. What began as a relaxing vacation quickly transforms into an unusual adventure filled with whimsy, action, and an overwhelming sense of brotherhood as the boys navigate their treasure hunt while relying on one another. Atsuko Ishizuka writes and directs the anime. Co-starring Natsuki Hanae, Yûki Kaji, and Ayumu Murase.