He does his work perfectly, dotting the i's and crossing the t's.

I conducted an interview in a question-and-answer format.

When I happened to pass by the library, I ran into an old friend by chance.

She was a secret kunoichi (female ninja).

He threw a handful of sand into the sea.

"Once in a lifetime" means to cherish the encounter that happens only once in one's lifetime.

He missed a once-in-a-lifetime opportunity.

He was focused on his work all day long.

One day, he suddenly decided to go on a journey.

No one knows what he did to spend one day.