Itsuki Nakano (中なか野の 五月いつき, Nakano Itsuki?) is one of the main characters in the manga and anime series 5-toubun no Hanayome. She is the youngest of the quintuplet sisters, along with Ichika, Nino, Miku, and Yotsuba Nakano. She is the first quintuplet that the protagonist encounters, and the two have a complicated relationship throughout the series. Itsuki is portrayed as an intelligent and confident student, but also a bit stubborn and headstrong at times. She is very close to her sisters and takes on a protective role towards them, especially when it comes to their father's, Maruo Nakano, expectations for their academic success. She is also passionate about food and aspires to become a food-related professional in the future. Throughout the series, Itsuki's character undergoes significant development as she confronts her own feelings for Futaro and navigates her complicated relationships with her sisters. Her story arc highlights themes of family, personal growth, and the challenges of adolescence.