"The Relationship Between Detective and Assistant is Like Romance!" Joku Mitsukue, who had always been in the shadows due to his innate "assistant nature" (a tendency to help others), made it his life's mission to "become the top" in order to break free from this situation. However, at his new high school, he encounters three detective girls, his fateful rivals from an old elementary school detective club. Thus begins Joku's fierce battle for the title of "top detective"! But... these girls also harbor some rather intense feelings for him, in a very different sense...!