Nakazono Tsubaki, the beloved daughter of a distinguished family, breaks off her engagement to Ichijou Takanori upon discovering his infidelity. However, this choice triggers a devastating series of events that culminate in her family's downfall and her own premature death. Granted a second chance by fate, Tsubaki awakens in the past with a steadfast resolve to alter her destiny. This time, she is determined to make her marriage to Takanori work, believing it is the key to saving her household. Unbeknownst to her, however, he harbors a dark secret that threatens to unravel her carefully laid plans and forever change the course of both their lives.