When a vengeful IT worker named John takes his own life following a brutal act of revenge, his fate intertwines with his loyal companion Alfred and the mysterious Eldritch God Chuthulos. Their supernatural pact grants both man and dog a second chance in a fantastical realm where Tamers forge powerful bonds with Monsters. Yet John's command over Eldritch energies carries a perilous price—his mere existence threatens not only his survival but the stability of the entire Eldritch Cosmos. Providence intervenes through the Rune of New Beginning, a divine system forged by ancient Eldritch Ancestors, transforming John into an unprecedented force of nature. Wielding unprecedented abilities—inspecting any Monster's true potential, unlocking evolution pathways, and constructing his personal Monster Paradise complete with custom biomes and habitats—John becomes increasingly resolved to honor his cosmic bargain. Alongside Alfred and a growing roster of god-tier Pet Monsters, John emerges as the ultimate Tamer, harnessing his system to reshape destinies and protect the worlds entrusted to his extraordinary care.