いしまてがいじゃないです
石馬刀貝じゃないです
ishimategaijanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of いしまてがい

1. It's not a stone horse knife shell.; It isn't a stone horse knife shell.

Negative
Polite
Casual Register
Usually Written in Kana