"Tsugumi is a recurring character in the Japanese manga series, ""Book Of Taboos."" She is a young woman with short black hair and striking blue eyes. Tsugumi is depicted as a reserved individual who prefers to keep to herself, but she has a deep sense of empathy for those around her. The character plays a prominent role in the series and her actions often drive the plot forward.

Tsugumi first appears in the second chapter as the quiet transfer student in the protagonist's high school. The main character is drawn to her enigmatic personality and finds himself wanting to get to know her better. Tsugumi initially comes off as cold and distant, but as the story progresses, it becomes clear that she has a tragic past that has led to her guarded demeanor.

Throughout the series, Tsugumi is shown to be a skilled martial artist, able to defend herself and others from physical threats. Despite this, she is also highly intelligent and often employs her strategic wit to solve complex problems. At times, Tsugumi's actions can seem irrational, but they are always rooted in her desire to protect her loved ones from harm.

The character's relationships with other characters in the series are complex. She is often seen as a loner, but she forms a close bond with the main character and his group of friends throughout the course of the story. Additionally, Tsugumi is shown to have a romantic interest in one of the male characters, which adds an additional layer of emotional depth to her character.

Despite her introverted personality, Tsugumi's actions throughout the series show that she has a deep sense of morality and a desire to do what is right. She is willing to take risks to protect those she cares about, often putting herself in danger in the process.

Overall, Tsugumi is a compelling character in ""Book Of Taboos"" who adds mystery and intrigue to the story. Her complex personality and emotional depth make her a standout among the other characters in the series."