After the Great Kanto Earthquake and the World War, people are living in difficult times. Protagonist Kitami Ichizou ran away from his wealthy home along with his maid and took up a job as a novelist. One day, he receives a mysterious letter of invitation to a dubious secret club called "Masquerade" where he meets Zakuro, the performer there. On the other hand, he also receives another letter from Sister Yurino, a nun working at the orphanage which Ichizou donated to in the past. Yurino's letter gradually reveals a troubling confession about her own hidden side. What will Ichizou do about these two peculiar cases and at what point will he end up? Find out and relive the old times in this S&M novel.