Age: 17 Date of Birth: May 5 Blood type: A Fifth sister of the Nakano Quintuplets. Itsuki is a serious and earnest girl. Her speech is formal and polite. She is also someone who cant be honest with herself and having difficulty to be more straightforward. Among the sisters Itsuki is the most familiar with Uesugihttps://anilist.co/character/128063s family members and circumstances. means five.