Hypnos is a cyberpunk styled strategy mobile game where players role-play as a professional who can change others' memories. One day, when a client asks the protagonist to change her memories, some vivid memories rush into his head. He doesn't recognize any of those memories, but he can see himself in them. To find out what is happening, players need to search for clues in various stages and help different clients to examine the life of the protagonist. What if everything you believe in was only fake memories? Are you brave enough to find out the truth about your life?