Shiro is a baby white dragon who journeys alongside a group of adventurers led by Pastel, including members Clay, Trapp, Rumi, and Kitton. He possesses a distinctive white dragon jewel. When Trapp's father discovers an identical jewel after visiting Mount Terrason, the group investigates the connection. This quest leads them to explore whether the linked jewels could help Shiro uncover clues about his parentage, driving their adventures centered on his origins.