Second-year Kasaba University student Nakata Seigi rescues a foreigner being harassed by drunks.

Seigi begins working at Jewelry Etranger with Richard, who gives strict instructions.

A small customer arrives at Etranger: grade school student Kasaka Hajime; Hajime asks for a gemstone similar to his Cat's Eye.

Yamamoto arrives looking for a garnet for her engagement ring.

One day, Seigi runs into Hase Keigo, the senior from his karate class who he admired; delighted by their reunion, Seigi refers Hase to Etranger since he is looking for a jeweler.

Seigi's university friend Shimomura introduces him to Okita Ayumi, another member of his club; Ayumi looks for clues concerning her missing boyfriend.