Case Files Of Jeweler Richard Gn Vol 03 (Mr) (C: 1-1-0) (08/24/2022)

Seigi, an ordinary university student, works at a jewelry shop run by the decidedly not-ordinary Richard. One day, a young boy named Hajime walks in, takes out a small cat's eye gemstone, and asks Richard for a matching stone. What story lies behind this particular request?