Oceania Legasea, a young mermaid, leaves her underwater kingdom to explore on her own. She discovers a deserted island chain called Sirenum Scopuli and decides to establish the first colony of merpeople above water. Oceania purchases a large beachside property to build a home for her descendants, founding the matriarchy of Legasea. Though she must sell her possessions to afford amenities, Oceania is excited to begin her new life and lineage on the islands.