どういもりじゃありませんでした
洞井守じゃありませんでした
dō imorijārimasendeshita

Noun
Desu Copula

The polite, past negative form of ほらいもり

1. Was not a watchman.; Was not a hole guard.

Past/Perfective
Negative
Polite
Terminal Form
Usually Written in Kana