A kid who can't die meets a detective club, and the show spends its first eight episodes convincing you this is the most human thing you'll ever watch. The mystery-of-the-week structure collapses by the middle and never recovers, but those opening episodes establish something real: what it means to want death when your body refuses to give it to you. You're watching a show about loneliness disguised as a detective story, and it knows exactly what it's doing until it suddenly stops knowing.

In the 2030s, the Boy Detectives Club operates under Kogorou Akechi, an enigmatic investigator whose team of young detectives takes on cases large and small using their special talents. When Kensuke Hanazaki encounters Yoshio Kobayashi, a boy rendered unable to die by a phenomenon called the Unidentifiable Mist, he finds someone who wants death and keeps away from other people. Hanazaki takes an interest in him and invites him into the club, promising in return to find a way for Yoshio to die. Yoshio accepts grudgingly, but as he works cases alongside the others, he slowly comes to acknowledge the group. Their meeting is bound up with the fate that ties Akechi to the greatest villain of the age, the Fiend With Twenty Faces, who threatens the club from the shadows.