Deep is an adventure visual novel with elements of an adult dating simulator. In 1999, World War III devastated most countries on Earth. At the beginning of the 21st century, Nexus began developing new technology that would eventually lead to the production of cyborgs. Nexus soon became the most powerful corporation in the world. But cyborgs broke out into the world and caused violent incidents everywhere. As one of four available characters, you have to sort out this situation and bring peace to the planet.