しろながすくじらでしょう
白長須鯨でしょう
shiro nagasukujiradeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of しろながすくじら

1. Probably a white whale.; Possibly a white whale.

Polite
Presumptive
Conjecture
Usually Written in Kana