One is a ruthless legitimate daughter, tempered by bloody lessons from her past life and returned with the experience of a bookkeeper and memories of mining contracts. The other is an ace lone wolf who crawled out of piles of corpses on the battlefield, burdened by the blood debt of his fallen comrades. In the White residence, a gilded cage for them both, each conceals their sharp edge. Through repeated tests and exchanges of favors, they go from wary of each other to entrusting their lives to one another.