light at the end of the tunnel
Idiomatic expression used metaphorically to describe hope or a positive outcome after a long period of difficulty or hardship.
長い不況の後、ようやくトンネルの先に光が見えてきた。
After a long recession, we are finally beginning to see the light at the end of the tunnel.
A direct translation of the English idiom 'light at the end of the tunnel', adopted into Japanese with the same metaphorical meaning.