Another beautiful day in Tokyo. The sun is shining and the wind is not so strong.
Today we have an idiom for you.
"Out of the blue"
This means completely unexpected.
Example 1
I was eating at Whole Foods in Hawaii and out of the blue, I saw my high school friend from Canada. Totally unexpected and an awesome surprise!
Example 2
This Coronavirus came from out of the blue and really put China into the world spotlight.