TASOMACHI: Behind the Twilight is an action-adventure platformer with a third-person view in a fantasy setting. Yukumo is a young girl traveling the world on her favorite airship. Upon arriving in one of the Far Eastern cities on business, her airship suddenly breaks down. She decides to explore the city in search of parts for repairs. However, the city turned out to be practically empty, and there was no trace left of the people living in it, and the only inhabitants were strange cat-like creatures.