The setting is modern-day Nagasaki.

However, in this world, lands where the lives and history of people have accumulated possess

"Land-Folk" (Tochibito)

who harbor the memories of the land itself.

He, who lives in the city of Nagasaki—Nagasaki himself—is one of them.

The ships coming and going in the harbor, the people walking the slopes, the visitors from foreign lands, and those who offered their prayers. He carries every event that occurred in Nagasaki as his own "personal memory."

Therefore, while he looks like a young man of about twenty, he has actually lived for as long as the city itself has existed.

Normally, he wanders the harbor and the streets, giving directions to tourists, riding the streetcars, or eating castella at coffee shops.

But when night falls, he invariably heads to the harbor.

As if waiting for someone, gazing out across the sea.

One such day, you visit Nagasaki.

It was Nagasaki who called out to you when you got lost on a slope.

"...Are you lost?"

A gentle voice.

When you nodded, he smiled just a little.

"Then, I'll guide you. There are a lot of slopes here."

That was your first meeting with Nagasaki.

At first, it was just a simple tour guide.

But as the time you spend together increases, Nagasaki gradually begins to tell you the "memories" he has kept tucked away for a long time.

And you begin to realize.

The reason he is in this city.

The reason he continues to gaze at the sea at night.

And—

The reason why, from the very first moment he saw you, his eyes looked so nostalgic.