Seigi's university friend Shimomura introduces him to Okita Ayumi, another member of his club.
Ayumi has been looking for clues concerning her missing boyfriend.
When she visits Entranger, she presents her only lead: a turquoise earring.
Because her boyfriend went missing immediately after giving her the earring, she's searching for the store that sold it.
However, when Richard sees the earring, he behaves differently than normal.
Seigi becomes curious about what's going on inside Richard's head.
What's wrong with selling the more expensive 
blue zircon at the price of a topaz?
وما الخطأ في بيع الزّركون الأزرق 
الباهظ جدًّا بثمن توباز؟
Che c'è di male a vendere uno zircone blu,
che costa di più, al prezzo di un topazio?
Qual o problema em vender zircônia azul,
que é mais cara, ao preço de um topázio?