He is an orphan and the chief operative of "The Nest", the world's only legal mercenary website. One day, after receiving the task of serving as a guinea pig for an experiment that is said to "return the body to its youthful state," he resolutely swallowed the capsule after being diagnosed with a terminal illness. But not only did his body change back to twenty years ago, but he actually returned to twenty years ago... Looking at the miniature version of himself in front of him, he decided that this time he must make "him" happy.