A live-action adaptation of the popular doujin: Hitogakushiki Minakata's "Kaku no Nest"! Her mother-in-law, Miki (Mizuki Yayoi), appears in the family where they live together. In the midday of her son, she felt uncomfortable somewhere in the presence of her young and beautiful girl. In response to Mahiru, who is troubled by her sense of distance from her 'mother', Miki is approaching her physical relationship as a woman, saying, "If she can't be recognized as a mother...". 'Mother and child', 'man and woman' ambiguous and sweet relationships, and the midday is drowning to the heart...