Crimson Waves on the Emerald Sea: Amaranthine Moon is a vampiric Victorian otome visual novel about love, loss, and the weight of time. The story follows Lucie, a young woman determined to shape her own future as she turns 18 and takes charge of her family’s business. Just as she is close to finalizing a revolutionary treatment for vampirism, her business partner suddenly dies, drawing her into a mysterious death and an event from ten years earlier.