Yumi was raised as the daughter of a farming family with a long history. Alongside her son Hiroaki, a graduate of agricultural high school, she took over farm work from her aging grandfather. One day, her grandfather suddenly passed away, leaving a will that read, "I leave the farmland and your mother in your care," entrusting Hiroaki with responsibility. In response to this request, Hiroaki inherited the farmland. However, during this process, he began developing romantic feelings for Yumi. To express his emotions, Hiroaki planned a hot spring trip in celebration of Yumi's birthday. Under the pretense of a relaxing journey to ease their daily fatigue, it became a special day intended to deepen their relationship.