F Rank? I Got a God-Tier System!

Dumped by his S-rank ex for being an F-rank loser, he faces death in a monster apocalypse. Suddenly, he awakens a god-tier system! By contracting and evolving stunning weapon girls like a succubus and an angel, he builds an unstoppable team. Watch the abandoned underdog rise to crush his betrayers and dominate the wasteland!

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