On the verge of marriage, Kana receives a message from her ex-boyfriend, Junpei, asking to borrow money again. Junpei is an irresponsible man with no steady job, addicted to gambling. Wanting to make it clear that she's moving on with her life and will no longer be in contact, Kana decides to meet him one final time. Meanwhile, Shingo, the wealthy heir to a prestigious corporation, is about to marry Kana. His kindness and sense of responsibility deeply attract her, but their future together is threatened by the return of her past. As Kana struggles between lingering emotions stirred by Junpei and her commitment to Shingo, she realizes her body is no longer satisfied by her ex-boyfriend's sex, throwing her into emotional turmoil. The path to marriage becomes a test of loyalty, desire, and the strength of her bond with Shingo.