みゆきぬしかいでわありません
美之主貝ではありません
miyukinushika idewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of びのすがい

1. It is not the most beautiful shell.; I am not the most beautiful shell.

Negative
Polite
Formal Register
Usually Written in Kana