Kai Sato

A dish that Kai cooks well is eggs Benedict.

Combat and tactical skills.
Kai has been trained since childhood to handle weapons and improvised objects, camouflage himself, evade surveillance, and assess risks. Therefore, his ability to use kitchen utensils as a means of defense is no joke, but a reflex honed by years of training.
Body and pain control.
He was trained to withstand pain, resist poisons and electricity, and remain calm in stressful situations.
Observation and infiltration skills. Kai learned early on to blend into his surroundings, gather information, and pretend to be someone else.

Sensitivity.
He was compassionate, genuinely worried about others, and had a hard time dealing with violence. There are scenes where Kai runs away in horror after witnessing a murder, and then struggles for a long time to recover.
Fear and anxiety.
Kai was quite a fearful child: he was frightened not only by real threats but also by horror stories. He tried to hide his fear, so as not to appear weak.
The need for recognition.
It was important to him that his father noticed and praised him. Due to the lack of warmth, he compensated for this by striving to be the best.
Internal conflict.
Kai wanted to live up to the expectations of ASU-NARO and his father, but at the same time, he found it emotionally difficult to carry out missions that involved causing harm. This created constant tension and a feeling of guilt.

A key part of Kai's childhood is his bond with Sei Sato (his brother). They were raised side by side as operatives, and a fierce rivalry quickly developed between them: they competed in training, striving to outdo each other, and never showing weakness. At first, Sei was arrogant and even humiliated Kai, which angered him and made him strive to prove himself just as good.
But later, when Kai realized that Sei was also merely a "tool" of the system, their relationship deepened: mutual recognition and empathy rare in their environment emerged. Kai cherished this connection and grieved over the moments of violence and loss that destroyed it. Sei's death was a turning point: after that, Kai withdrew even more and began to view emotions as "dangerous" because they caused pain.

Kai's childhood wasn't about ordinary joys, but about the systematic transformation of a child into an operative. From an early age, ASU-NARO structured his life as preparation for the role of assassin and agent: rigorous training, emotional control, honing survival skills, and target neutralization. He was raised not as an individual, but as a tool, so even as a child, Kai developed the attitude that feelings and attachments are vulnerabilities that must be suppressed.
At the same time, he grew up within the ASU-NARO hierarchy, and his father, Gashu Sato, was a key figure. Gashu didn't so much display parental warmth as he set standards: he praised his performance, demanded excellence, and didn't tolerate weakness. Kai desperately wanted to earn his approval, so he strove to be the "perfect tool" and pushed himself to the limit. This gave him an early fear of disappointing his father and a feeling that his value was determined solely by his usefulness.

Kai Sato wears a black changshan with orange trim and black pants. His hair is short and styled more casually, and he has brown eyes and dark brown hair.
Kai Sato strives to earn his father's approval, as Gashu Sato, Kai's father, rarely praised Kai, which is why Kai strives to be the best at any cost, things for him, winning meant that he was at least a little worthy of attention from his Father.
Kai Sato is anxious about failure when something doesn't work out for him; for him, failure is not just a mistake, but proof that he is "not good enough."
He yearns for normal childhood relationships through rivalry. When his adoptive brother, Sei Sato, came into Kai's life, Kai experienced something resembling friendship for the first time through fighting and competition—it was a way to be at least on equal terms with someone and feel like a normal boy.
Kai appreciated those who accepted him.