Okonogi Masaya's life fell apart when his father left him with catastrophic debt and nothing else. Through a sequence of events too improbable to fully rationalize, he ends up living at Vincennes Academy—a prestigious all-girls charm school populated by the Filles De La Vincennes, young women raised on propriety and careful social decorum. He is there as the sole male participant in a gender integration experiment, and reactions to his presence range from welcoming to alarmed. Princess Evangile is a visual novel developed by Moonstone.