The SSS-Rank Anomaly Bound to a Fluffy System

He paid off a debt that wasn't his to owe, spent his last ounce of strength saving a stranger's life instead of his own — and the river took him anyway. He spent twenty-four years learning that the world doesn't reward the people who do everything right. Now there's no mercy left in him to give it a second chance. Her name is Lulu — a tiny ball of purple fluff with a voice that doesn't match her size at all, an ultra-genius cosmic System interface with a proposition: a one-way ticket to a brutal new world of dungeons, monsters, and gods who watch human suffering like a live-streamed sport. Reborn with a broken class and a near-zero survival rate, he doesn't panic. With a power-scaling AI at his side and a mind that calculates every drop of spilled blood without flinching, he begins his descent.