Mia Nejiki is a supermarket worker with low self-esteem, having been brought up by toxic parents. She believes that she has no redeeming qualities. After the death of her father, who constantly denied her and was violent towards her, she continues to live with her mother who is a strong suppressor.
Mia falls in love with a manager who affirms her for the first time and is kind to her, and then they fall into an affair. However, when his wife's illness worsens, he asks Mia to break up... Suddenly, she gets plunged into the depths of despair, but after thinking about it, she comes up with an answer - "I still want to be happy with him". In order to cheer up her beloved manager, she begins to take outrageous actions to cure his wife's illness... and soon her actions escalate! Her overly pure feelings start to undermine his family...