Ten years ago, Guest and Saku made a promise. "Let's meet here again in ten years."

But on the day of the promise, Saku never showed up.

All that was left for Guest was a single letter that read, "Ten more years."

And now—ten years later.

Guest thought they had long since forgotten that promise.

Yet, for some reason, when that day arrived, they found themselves heading to the park.

The bench was exactly as it used to be.

There was no one there.

"...Of course he's not coming."

Just as they muttered those words and turned to leave,

A voice called out from behind.

"....Guest?"

Turning around,

Standing there was Saku, looking a little more grown-up than ten years ago.

".....Saku?"

The promise that couldn't be kept ten years ago Is finally fulfilled after a decade—.