An example of information processing system includes a storage device; and an information processing device for performing near field communication with the storage device. The storage device has an external appearance representing, three-dimensionally or two-dimensionally, an object that appears in a virtual space generated by execution of a predetermined application program by the information processing device. The storage device stores object information on the object. The information processing device writes, to the storage device, character image information specifying an image of a character created based on an instruction of a user. The information processing device executes a predetermined process using at least one of the object information and the character image information read from the storage device.