TV-Series
Description
Itsuki Nakano, the fifth and youngest of the Nakano quintuplets, possesses reddish-orange hair ranging from light pink to deep orange across media, typically styled medium-length with an expressive ahoge. Star-shaped hairpins near her eyes, signifying her birth order and name, are her signature accessory. Due to poor eyesight, she wears glasses during academics and maintains a formal school uniform appearance. Post-time skip, her hair grows longer with wavy ends, and she wears glasses almost constantly.

Serious and earnest, Itsuki strictly adheres to routines, waking early and never missing classes. She consistently uses formal keigo speech patterns. Her personality combines stubbornness, a tendency to hold grudges, and difficulty expressing emotions honestly, causing internal conflict. She becomes easily flustered by fear, stubbornness, or unfavorable situations, often leading to tears. A defining trait is her immense appetite; she eats frequently throughout the series, prioritizes food interests, and sometimes acts selfishly towards her sisters regarding meals. She also believes in fate and good-luck charms.

Academically diligent and precise, Itsuki excels in science and generally scores higher than her sisters. She possesses strong observation and deduction skills but suffers from a notably poor sense of direction. Despite her perceptiveness, she was the last quintuplet to recognize her sister Miku's feelings for Futaro Uesugi. Her career aspirations evolve into becoming either a teacher or a food critic, adopting the pseudonym "May" for her food writings.

Initially hostile towards Futaro Uesugi after an early quarrel, Itsuki gradually accepts him as a tutor, developing a complex bond. While her sisters openly pursue romantic relationships with Futaro, Itsuki's feelings remain ambiguous; she treasures their time together as friends and becomes a supportive figure in his life, interacting closely with his family. Her character arc focuses on personal growth, moving from rigidity towards acknowledging interdependence, with her romantic stance less defined than her sisters'.

Itsuki shares a close, protective relationship with her sisters, particularly Nino, with whom she shares similarities in routine, fears, and initial resistance to Futaro. She feels a deep connection to her late mother, Rena, whom she physically resembles. Her protective instincts emerge during family conflicts, such as confronting her stepfather Maruo over neglect. Despite occasional food-related selfishness, she values family unity.

Key quotes reflect her values:
- "In the end, we can’t know what he feels, what he thinks, unless we ask him personally" (highlighting direct communication).
- "The numerous days we spent studying for exams, fireworks festival, field trip, new year celebration... Doesn’t that already make us... friends?" (emphasizing shared experiences with Futaro).

Trivia notes her birth occurred at midnight, making her actual birthday May 6, though she celebrates on May 5 with her sisters. She is the only quintuplet whose name is a portmanteau ("five" + "moon"). In popularity polls, she ranked third in Japan, and she is the only sister who never kissed Futaro in the main series.