DRACU-RIOT! begins on Aqua Eden, an artificial island off Japan where casinos and other activities are legal. Mutsura Yuuto arrives with a friend expecting a straightforward vacation, but sees a kidnapping on their first day. When Yuuto intervenes, the incident sets off a chain of events that turns him into a vampire and leaves him confined to the island.
That transformation gives the adventure its defining contrast: a protagonist newly drawn into vampire life in a city built around the stated possibility of humans and vampires coexisting. The setting is described as a future midnight city, with vampires walking its moonlit streets; Yuuto’s abrupt change from tourist to resident supplies the central setup for his new nightlife.
Steam lists DRACU-RIOT! as single-player, so its format is an individual narrative adventure rather than a shared multiplayer session.
