おうこうもりじゃなかったです
大蝙蝠じゃなかったです
ō kōmorijanakattadesu

Noun
Desu Copula

The polite, past negative form of おおこうもり

1. Was not a large bat.; Wasn't a big bat.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana