まだこじゃなかったです
真蛸じゃなかったです
madakojanakattadesu

Noun
Desu Copula

The polite, past negative form of まだこ

1. Wasn't a true octopus.; Wasn't a real octopus.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana