Mari Takasugi's parents divorced when she was ten, and she was raised by her father and his new wife. However, life in the new household didn't go well, causing her to increasingly long for her biological mother. One day, reaching her breaking point, Mari decided to reunite with her birth mother. At that moment, she realized her feelings were more than mere nostalgia—she was experiencing love for the first time. In that instant, she became aware of her heart's true desires and felt the awakening of a new, profound emotion.