A girl who believes in the existence of platonic friendships between men and women challenges a game where she must win a prize by setting up an enticing mission for her male friend without him realizing it. As he continues to complete the missions, the pressure mounts and he becomes increasingly aware, his groin stiffening! Seeing this, the joy of being recognized as a woman causes a dark stain to appear between her legs! Before they know it, the spark between them ignites, and will they cross the line between just friends?