Shihori lived a peaceful life with her husband Yuji, who ran his own company. But when Yuji fell ill with cancer and passed away, their quiet life came crashing down. Left behind with overwhelming debt, Shihori finds herself pushed to the edge. Amid her despair, her brother-in-law Satoru—harboring deep feelings for her—steps in to support her. One day, while Shihori is still in mourning, a ruthless debt collector named Mori suddenly appears. Determined to exploit her vulnerability, Mori targets Shihori and treats Satoru with cold indifference. As Mori lays eyes on Shihori's beauty beneath her mourning attire, the story takes a dark and sensual turn.