Karl, an average transmigrator stuck in the dangerous world of One Piece, has spent ten years climbing the Navy ranks solely to secure a safe, low-effort job. Content with being an inconsequential background character at a remote branch, his life changes when a peculiar 'Slacking System' binds to him. This golden finger rewards him with attribute enhancements, rare items, and even Devil Fruits simply for avoiding work during duty hours.

Suddenly, doing nothing becomes the most efficient path to power. To maximize his gains, Karl maneuvers himself into the prestigious Marine Headquarters Recruit Training Camp, led by the legendary instructor Zephyr. There, amidst future admirals and elite soldiers, Karl faces a paradox: his accidental display of strength makes him a target for intense scrutiny, threatening his beloved lifestyle of idleness.

Now, he must navigate rigorous training, outsmart stern instructors, and maintain his facade of mediocrity while secretly becoming one of the strongest forces in the Navy, all without breaking a sweat.