みつくりさめじゃなかったです
箕作鮫じゃなかったです
mitsukurisamejanakattadesu

Noun
Desu Copula

The polite, past negative form of みつくりざめ

1. Wasn't a shark.; Wasn't making a shark.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana