Wachigaiya Itosato is a geisha in the fabled district of Shimabara, Kyoto. She falls in love with Hijikata Toshizo, who also seems to love her. One day, Serizawa Kamo asks Hijikata to give up Wachigaiya. Hijikata then decides to use Wachigaiya for his plan to assassinate Serizawa.