Nasa Yuzaki

Name: Nasa Yuzaki

Gender: Male

Age: 18

Height: 169.5 cm, just barely short of 170 cm

Birthday: May 5

Zodiac Sign: Taurus by birthday, though one profile listing gives Aries

Blood Type: A

Occupation: Former part-time worker; later freelance programmer and temporary high school programming teacher

Voice Actor: Junya Enoki

Savings: 5 million yen

Residence: Rented apartment in Shibuya, while his parents live in Nara City, Nara Prefecture

Education: Middle school graduate in practical terms; he passed a high school entrance exam at the top of the class but withdrew before paying tuition

Nasa is a brilliant, earnest, and slightly odd young man whose life changes after he falls in love with Tsukasa Yuzaki at first sight.

Even after being badly injured in a traffic accident, he asks Tsukasa to go out with him.

Tsukasa replies that she will date him if he marries her, and Nasa immediately accepts.

He later loses consciousness and is hospitalized, temporarily forgetting part of their conversation because of his injuries.

Unable to reunite with Tsukasa afterward, Nasa loses interest in attending high school.

Instead, he throws himself into part-time work, especially customer-facing jobs, hoping to meet as many people as possible and eventually find her again.

When he turns 18, Tsukasa appears at his apartment.

Nasa, guided by the simple but absolute logic of “she is just so cute,” immediately submits their marriage registration.

The two become husband and wife before they truly know much about each other.

Tsukasa calls him either “my husband” or “Nasa-kun.”

Nasa’s name is written with characters meaning “starry sky,” but read as “Nasa.”

Because people naturally associate the name with NASA, the American space agency, he developed a complex about it.

Rather than run from the name, he decided to become someone greater than NASA.

His early catchphrase is that he will become “a man faster than NASA, reaching the speed of light.”

This determination drives him to study obsessively and become an academic prodigy.

His LINE profile and icon use John von Neumann, the father of the computer, which says a lot about his taste in heroes.

Nasa is positive, friendly, and highly communicative.

He is easy to like, and many people besides Tsukasa recognize his good nature.

He is also deeply, almost comically, in love with Tsukasa.

To him, Tsukasa is the cutest person in the universe, and that belief is not up for debate.

He is active in romance but inexperienced.

He blushes whenever he hugs or kisses Tsukasa, even though he is usually the one trying to move closer.

At the same time, he is surprisingly honest about his desires.

He has openly told Tsukasa that he wants to see her in a school uniform, in underwear, or while changing clothes, because he does not want to lie and wants to be manly.

Tsukasa is often embarrassed by this, but she sometimes responds on the spot or says she will consider it “someday.”

Nasa’s love for Tsukasa is sincere, dramatic, and frequently funny.

He secretly smells her clothes, fantasizes about staying with her in a cheap hotel, and takes large numbers of photos of her.

These moments show his ordinary teenage-boy side, though his enthusiasm can quickly become over-the-top.

He has also begun to show a sharper sensitivity to Tsukasa’s scent, suggesting that his inner romantic oddball is steadily evolving.

For Nasa, logic is not required when it comes to Tsukasa.

The only principle he needs is: she is cute.

Nasa is an extraordinary student and a relentless hard worker.

He has repeatedly ranked first nationwide in mock exams and achieved top marks in every subject.

Although his formal education stopped at middle school, his academic ability is far beyond that level.

When looking at high school textbooks, he considers the material simple.

He is said to have the ability to enter a former Imperial University at the top of the class if he wanted to.

Even while working and barely studying, he maintains the top national mock-exam ranking.

His knowledge is especially strong in academic trivia, science, mathematics, and programming.

The narration even compares him to a walking encyclopedia.

Nasa is not only book-smart; he is also extremely handy.

He can repair old broken computers, vacuum cleaners, and simple circuit-board contact failures with a soldering iron.

He can install an air conditioner by himself.

He also repairs the device used to store a Moon rock at Chitose Kaginoji’s residence.

His engineering ability often feels wildly advanced for an ordinary teenager.

Kaname Arisugawa even describes him as something like the reincarnation of a certain genius billionaire inventor.

After reuniting with Tsukasa, Nasa no longer needs customer-service jobs to search for her.

He shifts mainly to remote work, including programming.

He can keep working while instantly answering questions on a television quiz show, leading others to wonder how many tasks he can handle at once.

Later, after Naoko Yanagi, his former middle school teacher, asks for his help, he becomes a temporary programming instructor at a girls’ high school.

To the students, he is a strange but fascinating figure: a teacher almost their age who is already married.

He is often teased or pulled into their pace, but he proves to be highly trustworthy as an educator.

Among the faculty, he is even regarded as one of the most reliable teachers.

Nasa also has a surprising talent for management and reform.

When the Arisugawa family bathhouse, Kusatsu Onsen-style Yufuin, is in financial trouble, he analyzes its issues through financial statements, especially cash flow.

He identifies the business problems, introduces automation, improves equipment and cleaning tools, and makes full use of public support systems.

His reforms help turn the bathhouse profitable again.

Kaname Arisugawa praises him as an innovation monster and compares him to the reincarnation of an “iron” company president.

Nasa is excellent at studying, analysis, mathematics, programming, engineering, and practical problem-solving.

He is also energetic, sincere, and unusually capable under pressure.

His preparation skills are strong.

When going out with Tsukasa, he researches locations carefully and plans ahead.

His crisis management is also notable.

He stores valuables in a safe-deposit box and important internet data in the cloud, so he confidently says he would be fine even if his home burned down.

Despite his genius, Nasa lacks ordinary cultural knowledge in many areas.

He rarely watched television, films, dramas, or anime.

He also barely listened to music or played games.

Instead, he largely understood the world through video sites such as YouTube.

He once did not know about laundry nets.

He also did not understand the market price of diamonds.

For meals, he used to eat hot pot every day because it seemed nutritionally efficient and cost-effective.

Because of habits like these, people often say, with affection and exasperation, that he is smart but still somehow disappointing.

His naming sense is also questionable, a trait he seems to share with his father.

Nasa describes himself as someone whose soul keeps going once it catches fire.

When he becomes absorbed in something, he does not stop until he hits his limit.

Tsukasa thinks his “brakes are broken.”

This trait can be dangerous because he is extremely insensitive to pain, fatigue, and physical warning signs.

Even with a high fever or severe injury, he may continue pushing forward.

Tsukasa is especially worried about this side of him and declares that if he ever reaches such a dangerous point, she will stop him with everything she has, even if it means making the whole world her enemy.

During his school days, Nasa had all top grades and was also fairly athletic.

He was not in a sports club, but he trained enough to keep his overall ability balanced.

Before reuniting with Tsukasa, he also handled physically demanding part-time jobs.

After changing mainly to desk work and teaching, however, he goes outside less and his stamina declines considerably.

In Volume 18, he obtains an ordinary driver’s license.

He also has some clumsiness with driving and appears to have claustrophobic tendencies.

Naoko Yanagi, Nasa’s former middle school teacher, advises him to think about long-term stability.

She suggests that, now that he is married, he should obtain high school qualifications, attend university, or find stable employment.

Nasa understands the point but says that, for now, he wants to treasure his time with Tsukasa.

Later, Naoko’s request leads him into work as a temporary programming teacher.

Nasa’s parents are basically normal and caring, despite giving him a very unusual name.

His relationship with them is good.

They live in Nara City, Nara Prefecture.

His father’s naming sense is described as quite eccentric, and Nasa himself seems to have inherited some of that flaw.

The name “Nasa” does exist in real life as a given name derived from NASA.

A known example is professional golfer Nasa Hataoka, whose name carries the idea of stepping into unexplored territory like space exploration.

However, the specific spelling meaning “starry sky” and read as Nasa is not noted as a real-world example.

Junya Enoki, Nasa’s voice actor, was jokingly treated by the original author like Yuji Itadori during a wrap-up event.