It's been a year since I lost my husband... - Her daughter, Miku, is also married and lives alone, and the only joy she has for her mother, Hitomi, is the conversations she has with her son-in-law, Daichi, who comes to see her from time to time. - However, Hitomi, who has come to see Daichi as a man, cannot suppress the urge that smolders within her heart and entrusts herself to him. - After crossing a line, their relationship changes dramatically, and Hitomi becomes absorbed in the warmth of the earth, which she intensely seeks every time she visits. - But one day, Miku, who was suspicious of the two, came to their house...