Futaro grew up in a financially struggling household, living with his younger sister, Raiha Uesugi, and their father, Isanari Uesugi. His mother passed away when he was younger, leaving him with a strong sense of responsibility toward his family. Because of their poverty, Futaro lives frugally and places a high value on academic excellence, seeing it as his only ticket to a better future.

His studious nature and top-tier grades make him one of the best students at Asahiyama High School, though he has few social connections due to his aloof and often blunt personality.

To support his family, he takes on a high-paying tutoring job, assigned to help the five academically struggling Nakano sisters. Despite initial resistance from the quintuplets, Futaro slowly wins their trust and helps them improve their grades, forming deep relationships with each of them along the way.

Futaro has dark blue hair with long bangs that partially cover his forehead and blue eyes. He usually wears his school uniform, consisting of a white dress shirt, a green tie, and a dark-colored blazer or sweater vest. When not in school, he wears casual but neat clothing, often opting for button-up shirts or hoodies.

As a child, he looked slightly different, with messy black hair and a red scarf, which became a significant part of his past.

Futaro is highly intelligent, diligent, and responsible, but also socially awkward and blunt. He prioritizes academic success over everything else and initially sees his tutoring job as nothing more than a means to earn money. However, as he spends more time with the Nakano sisters, he begins to develop a deeper bond with each of them, learning the importance of emotional connections alongside academics.

He rarely expresses his emotions openly, often coming off as serious and unapproachable. Despite this, he is caring and protective of his loved ones, especially his younger sister, Raiha. He is also incredibly patient and determined, refusing to give up on the quintuplets even when they actively resist his tutoring efforts.

Throughout the series, he gradually softens and matures, learning to navigate relationships and ultimately opening himself up to romance.

• Becoming the Nakano Sisters’ Tutor
  At the start of the series, Futaro is offered a high-paying job tutoring the wealthy Nakano quintuplets. Though hesitant at first, he accepts the offer due to his family’s financial struggles. However, he quickly realizes that his students are highly uncooperative and struggle academically, making his job much harder than expected. Despite facing resistance, Futaro persists, determined to help the sisters succeed. Over time, he begins to understand each of them individually, adjusting his teaching methods to suit their personalities and learning styles.

• The Bride Reveal
  Throughout the series, flashforwards hint at Futaro’s eventual marriage to one of the quintuplets, but her identity remains a mystery. Clues are provided through past memories, interactions, and key moments, building suspense until the final arc. In the manga’s conclusion, it is revealed that Futaro marries Yotsuba Nakano, as she was the first to develop feelings for him and had always supported him selflessly. Their bond, which began in childhood, ultimately leads to their union.