Garasu no Konpeitou

Ogikubo Nemuri is a maid who worked for Madam Karen, the wife of a Imperial Japanese naval colonel. One day, under government orders, the husband was stationed at a war plant to undertake manual labor. As a result, his family and Nemuri moved to the plant to live-in and work there. Nemuri was concerned about the sickly Madam Karen, as well as the soldier she fatefully encountered; a soldier named Gunjouji Mayato, who was also the commanding officer at the plant in which Madam Karen's husband worked at... [Translation of DL Site's plot summary.]