崩壊 ほうかい系列 けいれつではありませんでした
hōkaikeiretsudewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 崩壊系列

1. Was not a collapse series.; Was not part of the collapse series.

Past/Perfective
Negative
Polite
Formal Register
Physics