1. A non-transitory storage medium storing an image processing program of an image processing apparatus including an input device, said image processing program causes a computer of said image processing apparatus to at least: output an image obtained by imaging a virtual three-dimensional space with a virtual camera; determine whether or not a predetermined condition is satisfied; generate a two-dimensional surface in said virtual three-dimensional space when it is determined that said predetermined condition is satisfied; determine an attitude based on information acquired from the input device; and draw, in the virtual three-dimensional space, a two-dimensional image on said two-dimensional surface on the basis of the determined attitude.