Housekishou Richard-shi no Nazo Kantei S01E04 - The Fighting Garnet

Yamamoto arrives looking for a garnet for her engagement ring. Seigi feels positively about Yamamoto who has chosen a garnet rather than the standard diamond. However, when Yamamoto returns to the store, she seems to provoke Richard by stating that beauty is an advantage. Richard goes on to gently unravel the feeling sealed deep inside Yamamoto's heart...