When Tooru first arrives at a new all boys school he is surprised to bump into a beautiful girl that jumps out right in front of him. Little does he know that the girl is actually another male student who has been selected as part of the "Princess System." Princesses are selected to lighten the masculine atmosphere of the school by dressing up in frilly Gothic Lolita costumes. Tooru is quickly shocked to discover that he has been selected against his will to take part of the "Princess System."