Even at the End of the World, We Must Forge Our Souls

Post-apocalyptic + no zombies + growing protagonist + one heroine

A dark castle appears out of nowhere in the city's sky, while missiles explode across the city like fireworks...

A boy among the ruins meets a girl who is part machine, and a story of salvation begins in the apocalypse.

“What is love?” Beneath the stars, the white-haired girl gazed into the boy's eyes and quietly asked.

At that moment, the boy's shattered heart seemed to become whole again. He made up his mind: he would survive and save her.