According to a real estate agent, the Uchida family lives in a house that is "a little cramped, but a place where everyone can be happy." Until a woman named Kagami came to take care of her grandmother Matsuko. When Kagami started coming to visit her, her mother, Yasuko, seemed strange. The main character, Azuki, appeals, but his father, Yukio, who has a policy of avoiding things, doesn't take it seriously. Before long, good changes begin to occur in the family. Kagami, who says she is an acupuncturist, instantly healed Yukio's severe back pain, allowing her to find another job. Yasuko regained her cheerfulness, and it seemed that the couple's relationship, which had been a little strained, had improved. Is she really wrong about herself? Will Kagami bring her happiness like her mother and father say? That's how Kagami ended up staying with the Uchida family. However, Kagami's behavior begins to escalate gradually. She interferes with housework, meals, Azuki's career, social relationships, and even the color of her underwear, trying to deprive her family of freedom. A fantasy human drama about a family that is gradually undermined by a mysterious woman. A story of family breakdown and rebirth.