This quirky comedy‑mystery follows Keiichirō Nagumo, once a legendary teenage detective, now in his mid‑thirties and struggling with aches, outdated habits, and a failing agency. His life changes when energetic high schooler Mashiro walks in demanding to be his assistant—her enthusiasm dragging him back into detective work. The odd‑couple duo tackle absurd cases and unforeseen challenges, blending Nagumo’s old‑school sensibilities with Mashiro’s over‑the‑top determination. Anime fans can expect slapstick comedy, dynamic character chemistry, and heartfelt moments as the pair slowly rediscover purpose. Produced by LIDEN FILMS and directed by Rion Kujo, the series premiered on July 1, 2025, across multiple Japanese networks and streams globally via Crunchyroll.