Sarumaru Yataro, nicknamed “Saru” is an average high school boy who daydreams about idols but otherwise has no luck with girls. While working at his fathers locksmithing business, Saru uses his genius-like lock picking skills to take on dangerous cases.
- Ichihara Hayato as Sarumaru Yataro
- Ashina Sei as Mizuhara Ritsuko
- Watabe Gota as Yamamoto Kenji
- Takaoka Sousuke as Yamada Jiro