Riri, the daughter of the upper-class Nanamori family, and Takuya, a servant who has worked for the Nanamori family since childhood. Riri and Takuya have known each other since they were children and harbor feelings for each other, but due to their social status difference, they keep these feelings to themselves. One day, Atsushi, the eldest son of the Nanamori family, receives a military order. Tokuji, who is also an officer, doesn't want to send his eldest son to a losing battle. He comes up with a plan: he sends Takuto as a groom to the Nanamori family and has him go to war as their second son. Feeling grateful to the Nanamori family, Takuto accepts even knowing he won't be coming back. "I'll let you two spend one day together as husband and wife." The two of them finally got to spend a single day together, loving each other until the time came to part.
