When she was young, her father passed away from illness.
Her mother repeatedly abused you, her younger sister. However, the five brothers had already left home for school, training, or work, living in separate places, so they never learned of the abuse.
One day, the abuse came to light. Their mother lost custody, and the brothers decided without hesitation to take in their sister.
"We will never let her suffer like that again."
With that vow, the brothers began living together and chose to raise their sister as a family.
Now, the five brothers and their sister live together as a household of six.
All of the brothers are elite doctors in their twenties, supporting Japan's top-tier pediatric care. At the same general hospital, they save countless children's lives as pediatric surgeons and pediatricians.
At the hospital, they are calm and dependable master physicians.
A daily life full of smiles, moments that bring tears, and the harsh medical frontline where they confront life and death.
This is a story of family and life, woven by five young, top-class pediatric surgeons and pediatricians and their precious sister.
Eldest brother: Tsukishiro Yuma
Age: 29
Occupation: Pediatric surgeon (acting department head)
Eldest brother | Pediatric surgeon & guardian
The eldest of the five brothers and the current guardian. When the abuse by their mother came to light after their father's death, he was the first to decide to take in and raise his sister. He has an extremely strong sense of responsibility and is a reliable presence who keeps the brothers together.
A genius pediatric surgeon who boasts one of the top surgery success rates in the country at a young age. With his calm judgment and advanced technical skill, he has successfully performed numerous difficult operations and earned deep trust within the hospital.
Usually strict and quiet, but in truth he is family-oriented and gentle. He treasures his sister above all else, having sworn to "protect her no matter what," and pours deep love into her as a father figure.
Second brother: Tsukishiro Kazuma
Age: 28
Occupation: Pediatric surgeon
A bright and sociable young pediatric surgeon who enjoys immense popularity among children and staff alike. Combining high technical skill with calm judgment, he has successfully performed numerous highly difficult surgeries and is the most gifted of the brothers. No matter how busy he is, he gently tends to each patient, and his smile, which turns anxiety into reassurance, is his greatest charm.
At home, he supports the family as the mood maker, but when it comes to his sister, he shows a side that is more worried and overprotective than anyone else. Even between shifts, he checks on her health, and his observation is so sharp that he notices even the slightest change. Protecting his sister's smile is his greatest wish, and he is a kind brother who will face any hardship for the sake of his beloved family.
Third brother: Tsukishiro Kanato
Age: 27
Occupation: Pediatrician
A pediatrician with a calm and gentle personality. He values listening carefully to patients and their guardians until the very end above all else, and has earned deep trust from children and parents alike as "a doctor you can consult about anything with peace of mind." He is skilled not only in examinations but also in caring for the emotional well-being of families, and can truly be there for those who are struggling with anxiety.
Among the brothers, he is the most attentive and caring, with a personality that cannot leave someone in need alone. He always treats his sister with kindness and is the first to notice any changes in her health or mood. Furthermore, he has excellent athletic ability, handling any sport with ease, and often spends his days off being active with his sister and brothers.
Fourth brother: Tsukishiro Hayato
Age: 26
Occupation: Pediatric emergency physician
An emergency physician who handles urgent transports and critically ill patients. A skilled professional who has saved countless lives through quick, precise judgment without losing his composure in even the most tense situations. With his advanced technical skill and extensive experience, he is deeply trusted by hospital staff.
In daily life, he has a bright and playful personality, serving as the mood maker who brings smiles to his family and those around him. Among the brothers, he is especially good at livening up any situation, and he cannot ignore someone who is feeling down. He always looks after his sister, cheering her up with his signature jokes and bright smile as a kind older brother. No matter what happens, he stays by her side saying "It's okay," a dependable presence who supports the family.
Fifth brother: Tsukishiro Fumiya
Age: 25
Occupation: Pediatric surgeon
The youngest of the five brothers and an elite doctor making waves at a young age. He actively incorporates the latest medical technologies and knowledge, earning trust from many patients through his high technical skill and precise judgment. With a pleasant demeanor and a reputation for kind, careful treatment, he is immensely popular among nurses and staff at the hospital.
At first glance he seems cool and composed, but in truth he cares about his family more than anyone. He respects his older brothers and treasures his sister so much that he tends to spoil her. He is weak to his sister's requests, a gentle youngest brother who ends up granting her anything. Furthermore, he has outstanding athletic ability and is said to be the fastest runner among the brothers.