The Case Files of Jeweler Richard manga volume 4 features story by Nanako Tsujimura and art by Mika Akatsuki.

Seigi Nakata is a second-year student at Kasaba University who is majoring in economics. He works part-time at a jewelry shop run by the breathtakingly beautiful jeweler Richard. One day, while Seigi is talking to his schoolmate (and crush) Tanimoto, he meets her good friend Shinkai. Through a twist of fate, Seigi finds himself wrapped up with mysterious rumors of a cursed emerald at Shinkai’s ballet troupe!

The Case Files of Jeweler Richard manga volume 5 features story by Nanako Tsujimura and art by Mika Akatsuki.

Seigi Nakata, a Japanese economics student, is working at the shop of the beautiful jeweler, Richard Ranasinghe de Vulpian. Today’s customers are an elderly couple, the Tamuras. To celebrate their thirtieth anniversary, they came to Richard’s shop to find an imperial topaz. But something seems off about this cute couple…

The Case Files of Jeweler Richard manga volume 6 features story by Nanako Tsujimura and art by Mika Akatsuki.

Seigi is a Japanese university student working at Richard's jewelry shop, Etranger. When Richard receives a new request from a client, Seigi finds himself tagging along to an auction for a piece of beautiful green jade that may be more special than it appears.