2. In the plot, she is the most taciturn, introverted and difficult to get along with among the five sisters, and she is also one of the first characters to have feelings with the hero Shang Shan Kennosuke. Because of her complex personality, she often shows indifference, anger, helplessness and other emotions, so people often say that "it is difficult to describe her mood."
3. "It is difficult to calm down" means that a person's mood fluctuates greatly and it is not easy to calm down. In Five-Class Flower Marry, because of his complicated personality, Nakano Sanjiu's mood often changes, sometimes calm and rational, sometimes emotional, like a chaotic pool of water, which is difficult to calm down. Therefore, she is called the metaphor of "meaning is not flat" because her emotions and state of mind are complex and difficult to understand and calm.