Gandi arrives in a mecha girl world only to be mocked for his F-rank combat talent. As his family faces total asset loss, he activates the Godly Modification System to upgrade his units to SSS-rank. Working alongside Jeny and others, he unearths a deep conspiracy orchestrated by the Machine God Cult. His relentless upgrades and strategic moves ultimately dismantle the cult's plans, securing the safety of the entire world.