This is an exploration adventure game in which a girl named Saeki and her friend Maeda help people who have taken in bad souls called "lost souls" while exploring the "back alleys" with many back alleys. You can also enjoy life in the back alleys by walking through the nostalgic streets, talking with unique residents such as strange-shaped heads, half-beasts and demons, dressing up and eating parfaits at cafes. The goal of the game is to find a way to help the lost souls who cause incidents in the city through communication with the residents, purify them with amulets, and put up a barrier so that no more lost souls are born.