Monkey Lock) is a Japanese manga series written and illustrated by Naoki Serizawa.

A spin-off manga series titled Saitō - Heaven's Crow Fūun Risshi was serialized in the same magazine from November 2020 to June 2021.

[2][3][4] 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.

Mayumi (Manami Higa) enlists the help of Yataro Sarumaru (Hayato Ichihara) to open a bank safe deposit box.