In pursuit of the notorious thief “Subashiri no Kumagoro,” the Arson and Theft Investigation Squad corners him. Seizo, who has been actively working as their agent is killed by Kumagoro. Amidst the chaos, Kumagoro manages to escape from the squad. Four years later, Seizo’s widow, Onobu, is raising her young son, Yusomatsu, single-handedly while running a small tea shop. One day, she helps a traveling merchant named Shintaro, who collapses from a sudden illness in front of her shop. The two soon fall in love and promise to start a family together. Shintaro leaves on a business trip and promises to return in a few days. Right after his departure, Onobu is shocked to see a wanted poster delivered by the Arson and Theft Investigation Squad… Kumagoro’s face on the poster is the spitting image of Shintaro.