Kenta, who was adopted by the Tachibana family, had difficulty adapting to his new environment. He had run away from home. Exhausted by his lonely life in Tokyo, he returned home for the first time in several years and was greeted by his sister-in-law, Mary, the only person who had ever shown any Kokoro for him. However, she had already gotten married and had since left the family. Unfortunately, she lost her husband in an accident and became a widow. As they spend their days together again, Kenta tries to make up for the time he lost... In order to ease Mary's loneliness, the two of them seek each other's warmth.