「Adjectives and Adverbs」
「Adverbs Expressing Time」
"soon," "shortly," "before long"
mamonaku indicates that an action or event will occur shortly or that it has occurred not long after some other action or event.
Mamonaku Kyōto yuki ga hassha shimasu.
The train bound for Kyoto will depart shortly.
Nihon de wa mamonaku sōsenkyo ga okonawareru rashii.
It seems that a general election will soon be held in Japan.
Futari wa kekkon shite, mamonaku rikon shita.
The two got a divorce not long after getting married.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °