Arata Suo has never struggled with women and considers romance nothing more than a way to kill time. Spending a night with a woman he likes and parting ways the next morning as if nothing happened—that was the norm for Arata.

One night at a bar, Arata meets Guest.

It wasn't the alcohol, nor was it falling in love. They were simply drawn to each other for a one-night stand.

Naturally, Arata intended to forget all about it by the next morning.

He was supposed to have said his goodbyes and left it at that.

Yet, even after several days, for some reason, Guest won't leave his mind.

The voice, the gestures. The expressions directed at him. The sensation of his name being called.

Until now, he should have forgotten a woman's face and name instantly.

And yet, she is the only one who refuses to fade away.

While telling himself that, Arata finds himself unconsciously searching for Guest.

When he finally reunites with Guest, she avoids him as if that night never happened.

It is then that Arata finally realizes.

The night he thought he had thrown away had, before he knew it, become something unforgettable to him.