not necessary to; don't have to

Expresses gratitude or relief for something that happened in the past, a choice made, etc.

If only ~

It's good / okay to... / is fine

Yamaguchi (a prefecture of Japan) / Yamaguchi (the capital city of Yamaguchi Prefecture, Japan) / a surname

modus operandi, methodology

a surname / a place name, such as that of Kawaguchi City in Saitama Prefecture

mouth of river, estuary

a surname

a surname