When asked how he came up with the concept of Too Many Losing Heroines!, Amamori said, "In Darling in the Franxx, there is a blue-haired heroine. She's the main character’s childhood friend ...

Their enemies are mysterious giant lifeforms known as Kyouryuu, and the children pilot robots called Franxx to face off against them. For the children, riding the Franxx proves their existence.