Three years after their mother's passing, the older brother continued living alone in the family home. During winter break, Kaori Otonashi and her husband returned home for the first time in about a year. Though overjoyed to see his younger brother again, the older brother secretly knew that his brother Kenji had developed diabetes at a young age and suffered from erectile dysfunction. The couple's lack of a physical relationship added depth to the unfolding story. Amidst the bonds of family and hidden truths, a new and forbidden relationship begins to blossom.