A character in Go-toubun no Hanayome. The fifth and youngest of the Nakano Quintuplet sisters. Itsuki has a two-faced personality; she's always friendly with acquaintances and classmates but when around Fuutarou she goes into an attack mode due to his past insults. She loves to eat food and studies seriously, even though her methods need improvement. Her best subject is science.
She has blue eyes, large breasts, and long red hair stylized with bangs, hair between eyes, and a ahoge. She wears two star hair ornaments and her school uniform consists of a open black blazer, red sweater/red sweater vest, white collared shirt, and green pleated skirt.