Maia, a seventeen-year-old girl and main character of the game, travels to Northern Cross, a marine research station where her father is working. The team at Northern Cross is excavating ruins that are believed to be from an ancient temple of the Mu dynasty. After a dream, Maia visits the ruins and investigates the mystery of the temple with the dolphin Luka. Throughout the game they cooperate to solve puzzles. A large part of the game is spent underwater, exploring.