Imagine a world where Earth is no longer just a planet, but a battleground in a cosmic Armageddon. When a global announcement rips through reality, teenager Arthur, scraping by in the slums, finds himself unwillingly drafted into a universe-spanning game. But this is no ordinary game. It’s a fight for survival, and Arthur's only weapon is his unique, if initially flawed, talent: Primordial Summoning. Except, instead of the earth-shattering beast he expects, his SSS-Ranked ability gifts him… a cat? Don't be fooled by the initial fluff. This is where *Online Game: Starting With SSS-Ranked Summons* truly takes off. Arthur's journey is one of unexpected power and hilarious twists. As the game bleeds into reality, he discovers the true potential of his summoning ability, amassing not just one, but dozens of legendary companions. From dragons to mythical beings, Arthur's unconventional army becomes humanity's last hope against encroaching darkness. With each summon, he unlocks unbelievable skills, turning him into a force to be reckoned with. Will Arthur, the slum kid with a cat, rise to become the savior the universe desperately needs? Dive in and discover a world where the cutest companion might just be the deadliest weapon.