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A young woman named Yuka works as a housekeeper at a lavish seaside mansion owned by the wealthy and enigmatic Kaito. Kaito, who rarely shows emotion and keeps everyone at a distance, suddenly proposes a contract marriage to Yuka with strict conditions attached. Despite the vast differences in their social status and the cold terms of the arrangement, Yuka accepts and moves into the mansion as his wife. From the very first day, Kaito begins treating her with unexpected tenderness and intense devotion behind closed doors. As Yuka gradually adjusts to her new life, she starts to uncover small glimpses of the hidden pain Kaito carries within him.
