Suze, a somber but caring girl, visits the Bianca Aquarium with her best friend Lulu in order to make use of a premium ticket that she has obtained by chance. With the director's wife, Chris, guiding them through the aquarium, Suze and Lulu enjoy an extraordinary experience at the facility, until Lulu suddenly disappears. While exploring the aquarium in search of Lulu, Suze finds herself lost in a mysterious aquarium that looks a lot like the one she was in before...