上位 じょうい蜃気 しんき ろうでしょう
jōishinkirōdeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 上位蜃気楼

1. Probably top-ranked mirage.; Likely a top-tier illusion.

Polite
Presumptive
Conjecture