Hidden Mecha Valkyrie

In a mecha apocalypse, Kyle is publicly dumped by an S-class mecha maiden, yet he unexpectedly awakens an SSS-class contract talent and bonds with the mightiest Contract System. Ignoring the jeers of the crowd, he seeks out overlooked, hidden mecha maidens. He nurtures E-class Freya and F-class Silvia all the way to SSS-class. The once-worthless outcast, alongside three supreme mecha maidens, crushes geniuses and abyssal foes alike. In the end, he defeats the Abyss Overlord and rises to become the strongest Contractor!