るりでわありませんでした
瑠璃蜚蠊ではありませんでした
ruri dewārimasendeshita

Noun
Desu Copula

The polite, past negative form of るりごきぶり

1. Was not a cockroach.; Was not a jewel beetle.

Past/Perfective
Negative
Polite
Formal Register
Usually Written in Kana