こう性能 せいのう爆弾 ばくだんじゃないです
kōseino ubakudanjanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 高性能爆弾

1. It's not a high-performance bomb.; It isn't a high-performance bomb.

Negative
Polite
Casual Register