The Time Machine Appears

A "time machine" is a fictional machine that can travel to the past or future.
This song is based on the theme of a time machine.
The protagonist of this song is in a hopeless situation.
At that moment, a time machine suddenly appears in front of that person.
"Perhaps I can travel to the future and find out the outcome."
"Or perhaps I can go back in time and start over."
However, the protagonist hesitates to use the time machine.
"How does I know that an object I'm seeing for the first time is a time machine in the first place?"
With such questions in mind, the song continues into the second half.
This song tells such a story.