After divorcing her husband, Yuki Nanami had been living separately from her son, Yuta. In their younger days, the two found it difficult to accept the reality of losing the person they loved, and as time passed, their feelings for each other gradually transformed from love into something abnormal. One day, Yuki's ex-husband suddenly died, causing the two to reunite after a long separation. This encounter would reopen the wounds of their past.