Sunset Hills is a hand-drawing novel-style narrative puzzle game about the travels of novelist Nico after his discharge from the army.

As Nico travels by train to each city to visit his former comrades, the player encounters a variety of people and events and learns about life through solving puzzles along the way.

As they reunite, they reminisce about their past experiences in the war, unravel the war and Nico's past, and gradually reveal the true purpose of Nico's journey.