かやねずみじゃなかったです
萱鼠じゃなかったです
kayanezumijanakattadesu

Noun
Desu Copula

The polite, past negative form of かやねずみ

1. Wasn't a vole.; Wasn't a pika.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana