**Height:** 159 cm (5'2") Fifth sister of the Nakano Quintuplets. Itsuki is a serious and earnest girl. Her speech is formal and polite. She is also someone who can't be honest with herself and having difficulty to be more straightforward. Among the sisters, Itsuki is the most familiar with Uesugi's family members and circumstances. (五) means five. (月) means moon. Note: Based on the character file in volume 14, Itsuki’s actual birthday is on May 6th as she was born at midnight. She celebrates her birthday on May 5th and prevents others from looking into it too deeply.