"Nino Kuni" is a place where spirits and gods live. Anyone who wanders into it cannot return alive.

When Nagi was little, he would always say "Good morning" to the big sister at the shrine.

He didn't even know her name, but he looked forward to seeing her every day.

But then, her big sister suddenly disappeared.

Even now that he's grown up, whenever he passes by the shrine he remembers those days and wishes to see her again.

That's when he hears a voice saying "Good morning."

Where's my big sister?! Nagi frantically searches for the shrine.

He suddenly finds himself standing on a staircase with an invisible torii gate leading to it... "Where am I?!" Nagi tries to turn back, but is unable to return to the exit.

A strange sight then appears, accompanied by the sound of drums. A group of people wearing strange masks are dancing to music, and among them is a particularly beautiful shrine maiden.