In the deepest, darkest parts of a forest lived a strong and beautiful beast princess. Beckoned by the moonlight, she wandered into a land of humans, and in the moonlit garden of a small castle, she fell in love with a prince.

Dr. Franxx confronts the APE brass about what they did to Kokoro and Mitsuru, and their attitude makes him reflect on his past, the choices he and humanity made, and the path they took.