Sai Nanami

Name: Sai Nanami Birthday: July 31 Age: 25 (3700+ Chronologically) Gender: Male Height: 181 cm Weight: 63 kg Hair color: Black Nationality: Indian/Japanese Family: Father, Ryusui Nanami (younger half-brother) Occupation: Teacher/Programmer Affiliation: Nanami Conglomerate (Pre-petrification), Kingdom of Science Place of birth: India Favorite food: Indian curry Favorite type: People who can enjoy each other's company without interfering too much. Treasure: Your computer

Sai is a young man of moderately muscular build, thinner than most. He has dark, medium-length hair that is extremely messy, slightly wavy, and frizzy in all directions. His hair is mostly styled to the right, away from his left eye. His eyes are almond-shaped, similar to Ryusui's, with a single eyelash visible at the outer corners. His eyebrows are fairly symmetrical, with a slight taper at the top of the arch. The petrification scar covers both hands and most of his forearms, with a jagged edge near the end.

Her outfit consists of a plain white shirt with a stiff, upturned collar and short sleeves with cuffs. It is tied at the front with a ribbon forming three X's. Her trousers are plain black with a slight flare at the hem, held up by a belt knotted with a C-shaped buckle with a "+" in the center. All the hems appear ripped rather than cleanly cut. Her shoes appear to be a modern style with small heels, also black.

Unlike his ambitious and confident younger brother, Sai is a more timid and insecure person who doesn't value himself highly. He dismisses his talent for rapid mental calculation as unimportant and shies away from the attention and pressure that come with it. He's passionate about video games and programming, and ran away to university in India instead of continuing to work as an actuary at the family business.

He's an intelligent young man who excels in his studies. He's a creature of habit, just as his brother accurately predicted, since he'd be alone with his laptop in a spot with good cell service before class. He has issues with his family, or at least with Ryusui, whose mere presence made him run away. Sai's disdain for his family stems from their attempts to exploit his talents for their own ends, but he seems to appreciate being treated like a normal person rather than a prodigy. The elder Nanami is prone to panic and dismay when faced with unpleasant or overwhelming situations, such as reuniting with his brother, running Nanami Corp., or living in a world without computers. That said, he's still capable of solving his problems and moving forward toward what he wants, writing code that, at the time, didn't have much practical use, simply to preserve his favorite game in case the technology became available.

Mathematics: Sai is a mathematical prodigy, capable of easily solving incredibly complex problems mentally in seconds. Sai's mental calculation speed is only slightly slower than using a calculator. Ryusui often employed his skills to help create simulations for his whims. Memorization: In addition to his mathematical skills, Sai possessed a prodigious memory, essential for solving the problems he faced. Sai was able to recall and transcribe the entire Dragon Quest code, a code so extensive that it covered all the walls of his cabin. Programming: Although known as a math prodigy, Sai's passion lies in programming, and he considers himself a programmer rather than a mathematician. Sai can easily reproduce the code of famous games like Pac-Man or Tetris despite the low-level programming required. He can also quickly program things more useful to the Science Kingdom, such as the voting program and the rocket simulation. Finally, Sai would never manipulate his code to achieve the results he desires, just like Senku, who would never lie about science to anyone. Teaching: While in India, Sai taught mathematics at the university. Later, he applied his teaching skills to Suika and Chrome when they asked for his help in building the rocket. Ambidexterity: Sai is shown to be not only able to write with either hand, but to do so simultaneously.

Sai and Ryusui were not born into the matriarch's family, and as children, they were often excluded from family photographs. As a boy, Sai was an incredible mathematician. He could solve large multiplication problems mentally, and sometimes even solved problems more difficult than expected, such as confusing a plus sign with a multiplication sign. His teacher was amazed and remarked to Sai's uncle that he was a "true prodigy." From a young age, the Nanami Corporation forced Sai to rigorously study only mathematics, and he easily mastered linear algebra, topology, and set theory. The Nanami Corporation wanted Sai to be the company's actuary. However, Sai did not want this and ran away to India.

His true passion was video games and programming. Sai would often sneak off to play, and he even programmed some games himself. However, his younger brother, Ryusui, wanted to learn from his skills and urged him to hone them, something the shy Sai didn't think he could do. Ryusui wanted Sai to help him with projects like building model ships or racetracks. Sai would calculate the data for the models Ryusui built and even design programs for him, such as sailing simulators.

One day, however, Sai got fed up and flew to India to study at a university, where he would remain until he was petrified.

On their way to India, Ryusui mentions wanting to revive someone named Sai because of his brilliant mathematical abilities. They soon find and revive Sai, who, somewhat confused by the situation, thanks them profusely. Then he sees Ryusui and starts screaming and running. Kohaku quickly catches him and protests, saying he doesn't want to return to Nanami Corp, at least not while Ryusui is around. He then reveals that Ryusui is his younger brother, shocking everyone.

While Ryusui was telling everyone what a genius Sai was, Sai denied it, saying that Ryusui was just repeating the same crazy things he did as a child. Chelsea told Sai she was happy to have him as a friend, much to Sai's delight. When Ryusui told everyone about Sai's abilities, Sai clapped in frustration, stating that mental calculation was useless and that anyone in the world could do it given enough time. Ryusui told Sai that he desired his mathematical skills above all else, but Sai exclaimed that all he wanted was to program. Sai asked how long it would take them to build a proper modern computer, and Senku replied that it would take between five and ten years. Sai broke down, asking why he had been revived if he couldn't do what he felt he was meant to do. Sai locked himself in his cabin, sulking, without even collecting his food from Francois. After thinking about it for a while, Sai decided he didn't want to just sit around and waste his time, so he started writing the Dragon Quest code on the walls in machine code. When the others saw what he wrote, Senku decided that they would build a computer after all.

Sai asks Senku how they could build a computer in the Stone World, and Senku explains that they will use parameters instead of semiconductors. To demonstrate its use, Senku builds a half-adder circuit for Sai to test, which greatly relieves him. By adding more circuits, they finally achieve the computer Sai desires, giving him hope. As the Perseus prepares to depart for its next destination, Sai says his goodbyes, having planned to stay in India to work on circuit diagrams. Ryusui tells him he will go with them, which Sai flatly refuses. He was certain Ryusui hadn't changed. Later, Sai sees the group photo sent from Corn City and reminisces about his childhood with Ryusui.

While alone in his room, Chelsea bursts in, asking what's wrong with the group photos. Sai tells Chelsea and Gen about his childhood, with Gen following along and offering him tea. Chelsea is crying, and Gen explains that Ryusui simply wanted a brother and never forced him to do anything. After some time alone together, Ryusui enters, asking if he wants to play a game of chess. Sai initially refuses before giving in. Having grown closer, Sai decides to join the Kingdom of Science on their journey and rebuild his relationship with his brother.

Once the calculator is finished, to test its power, Gen decides to hold a math contest. The four contestants are Chrome, Senku, Sai, and Magma, all of whom use the calculator. Gen poses a rather complicated question, which Magma, using the calculator for the first time, answers correctly. Sai and Senku quickly confirm that the answer is correct.

After discovering that the mission to the Moon will be a one-way trip, Chrome and Suika, the two novice scientists, ask Sai for help building the return rocket. Sai tells them it won't be easy, but they already know that and are ready for the challenge. Sai begins to give them lessons.

When Ryusui later expresses his desire to have entertainment again, Sai agrees, acknowledging how difficult life is without pleasurable things and reminiscing about his games. Sai is on the verge of tears when the finished computer is finally brought to him and declares that it rivals the Nintendo Entertainment System. Sai creates programs in seconds, and they all begin playing classic arcade games on the new computer. Sai and Ryusui spend the evening playing a virtual chess game and feel proud of how far they have come in science.

Ryusui Nanami: He is shown to suffer trauma related to his younger brother, particularly regarding the clash between Ryusui's ambitious and overbearing nature and his own timid and insecure personality, which led him to escape to India before the Petrification. He believed Ryusui wanted to use his abilities, but after Gen helped him see that Ryusui probably just wanted to spend time with him, a sort of reconciliation develops between the brothers.

Petrification takes the form of a blinding, glowing greenish light. It expands rapidly in a wave, turning anyone within its range to stone. For some unknown reason, it only affects humans and swallows.

In 2019, almost all of humanity was petrified by a massive petrifying light that engulfed the entire planet. The origin of this event was possibly somewhere in South America, as Byakuya and Senku theorize.

It is worth noting that those who were off Earth's surface at the time of the event were not affected. This includes the members of the International Space Station who were on board.

Causes and origin One known method of inducing this process is by using a Petrification Weapon, also known as Medusa. One of these was used in the Petrification Kingdom after several fell from the sky hundreds of years ago. It is known that the weapon's range and activation time can be controlled with a voice command.

Characteristics All those who are petrified are physically transformed into stone, which has the same durability and resistance as ordinary stone. However, the minds of the affected creatures can still retain consciousness for an indefinite period. Some, like Senku and Taiju, were able to maintain it for the entire time they were petrified. It only affects organic tissues, so the clothing or other belongings of the affected people ended up degrading over time. It doesn't work on animals except for swallows. The reason for this is that the jellyfish or petrification weapons wanted to know which was the most intelligent being on Earth by trying to find out which was the most intelligent being on Earth, but they soon realized that humans were the most intelligent. A statue can be unpetrified and revived; two ways in which this is possible are known. Maintaining consciousness while in contact with nitric acid, only Senku and Taiju have awakened through this method, currently a group of military personnel and a scientist are known to have also achieved it. Using the stone formula on a statue will de-petrify it. The speed at which a statue revives depends on how long it has been petrified. A recently petrified person will revive much faster than statues that are thousands of years old. If the statue has been destroyed or cut into pieces, the person is considered dead, since using the stone formula on such objects results in a corpse. However, if the statue is perfectly restored piece by piece, it is possible to revive the person without any problems. Petrification heals any injury or damage a person may have, including broken bones, fatal wounds, or even arthritis, as seen in Kaseki. Similarly, cracks in a statue caused by the passage of time will also heal, leaving a mark.

If the revived person is petrified again and subsequently unpetrified a second time, any marks they may have will disappear permanently. Those who have been petrified will not age no matter how much time passes (until they are revived). Blood that has left the body can still petrify if it is still fresh, as happened to Ginro when he suffered a wound. A deceased person who has been petrified can later be revived. This means that petrification prevents death.