Simple 2000 Series Vol.122 - The Ningyo Hime Monogatari - Mermaid Prism is a japanese dating sim, this female-targeted love simulation puts players in the role of a high school student that one day gets warped to a separate world, becoming a mermaid along the way! Good thing she was a member of her school's swimming club! The game allows players to move around on a map, viewing events and gaining experience. The Limited Edition features a Drama CD, 28 pages book and some illustrations.