二十 にじゅう いち だい しゅうじゃないです
nijū ichidaishūjanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 二十一代集

1. It's not a 21st-generation collection.; It's not a family line of 21 generations.

Negative
Polite
Casual Register