I was dumped by the campus queen as a "D-rank loser"—10 days later, she begged me to zap her!

What the story is about

After crossing into a world where humanity survives behind fortress-city walls, low-talent Li Qingshan awakens a system that lets his Electric Serpent clone devour flesh and feed its growth back to him. As the serpent evolves and Li rapidly gains power, he takes on arrogant rivals and hunts the ferocious beasts threatening the city.