A high school reunion is a largely unpredictable event. You never know how life has turned out for your former classmates and who they have become. The main character of Detached House Escape was surprised to learn that his former deskmate had become a successful entrepreneur. They had always liked each other, so they decided to leave the reunion and continue the evening at a restaurant. As a result, the hero wakes up in an unfamiliar house, remembering little about the previous night, but knowing very well that he needs to get to work and the house is locked.