A burnt-out detective who peaked at seventeen finally gets a case worth solving, except the case is his own irrelevance. The comedy lands because Nagumo's not trying to recapture youth, he's trying to remember why he ever wanted to be a detective in the first place. A high school girl walks into his office and somehow that becomes the story of a middle-aged man discovering he's not finished yet.
Nagumo Keiichirou once solved the unsolvable. Back in high school, his detective skills were legendary, his mind sharp as a blade. Now at thirty-five, his agency gathers dust alongside his joints. Bills stack higher than case files. The rent looms. His glory days feel like someone else's memory. Everything changes when a high school girl walks through his office door. She wants in on his cases, convinced the burned-out detective still has what it takes. Skeptical and broke, Nagumo agrees. What follows is a collision between a washed-up genius clinging to faded brilliance and a teenager brimming with raw energy and naive optimism. As they tackle investigations together, something unexpected happens. The girl's enthusiasm cracks through Nagumo's cynicism. Old instincts resurface. The detective who thought his best years were behind him discovers they might not be over yet. Mystery and humor intertwine as this unlikely partnership uncovers not just case solutions, but reasons to care about the work again.