Itsuki Nakano is a fictional character from the popular anime and manga series The Quintessential Quintuplets. She is one of the five Nakano sisters, each with distinct personalities and traits. Itsuki is known for her studious nature and determination, often striving to achieve her goals, particularly in her academic pursuits. In the series, Itsuki has a strong sense of responsibility and is dedicated to her family. She often clashes with her sisters due to her serious demeanor but also shows a caring side. Her character development throughout the story highlights themes of growth, friendship, and the importance of family bonds.