場当 ばあたり稽古 けいこじゃないです
bātarikeikojanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 場当たり稽古

1. It's not ad-libbed.; It's not impromptu.; It's not off-the-cuff.

Negative
Polite
Casual Register