Yataro Sarumaru, nicknamed "Saru" is an average high school boy who daydreams about idols but otherwise has no luck with girls. While working with his father, a locksmith in Asakusa, Tokyo, he has gained exceptional skills to pick just about any lock. Using his exceptional skills, Yataro then finds himself solving various mysterious cases, while also trying his luck with the girls.

Ce synopsis est en anglais : nous ne l'avons pas encore traduit.