An example game system includes a portable display that includes an image-capturing unit, and a display unit. The game device obtains first operation data representing an operation performed on a controller device, second operation data representing an operation performed on the portable display, and data of a image captured by the image-capturing unit. In a virtual space, an action of a first control object is controlled based on first operation data and an action of a second control object is controlled based on second operation data. The game device generates a first game image including a game image that represents the virtual space and corresponds to the first control object, and at least a portion of the captured image. The first game image is displayed on a predetermined display. The game device generates a second game image corresponding to the second control object, and displays the second game image.