Shoji Tokairin, a postgraduate student researching AI, gets lured in by a huge paycheck and takes on a part-time job from a mysterious organization called Miyama Zoo to develop an app. Impressed by his work, the director of the organization gives him the codename Owl and recruits him into Miyama Zoo.

But, things take a dark turn when an accident happens at one of the works he was assigned. As he digs deep about the organization out of paranoia, he discovers that Miyama Zoo is actually a group of criminals, each using animal-based codenames. By the time he realizes he has been unknowingly aiding criminal activities, he's already knee-deep in the operation.

Figures with names like Bambi, Jackal, and Monkey begin appearing one after another, dragging him into high stakes, life or death missions. Can he escape? Who's really on his side?

The game has begun, and there's no turning back.