びわこおうなまずでしょう
琵琶湖大鯰でしょう
biwako ō namazudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of びわこおおなまず

1. Probably the giant catfish of Lake Biwa.

Polite
Presumptive
Conjecture
Usually Written in Kana