Nasa was born with a unique name, intentionally chosen by his parents to evoke the grandeur of the American space agency NASA, with the hope that he would achieve greatness. Despite early embarrassment about the name, Nasa embraces it and grows up determined to make something of himself.

He becomes known as a prodigy, scoring top marks on national exams and planning to attend a prestigious high school. However, everything changes the night he meets Tsukasa, a mysterious girl who saves his life during a near fatal accident. Captivated by her, he confesses his love, and she agrees to be with him on the condition that they marry. After a long separation, she returns, and the two are wed, marking the beginning of their unconventional yet heartwarming relationship.

Nasa is a relatively short teenage boy with neatly kept pinkish hair, light violet eyes, and a lean build. He typically wears simple, practical clothing, including sweaters, jackets, and comfortable pants, suited to his modest lifestyle.

He has a calm and modest appearance, often with a serious or contemplative expression, reflecting his logical personality. His look is clean and unassuming, in contrast to the ethereal beauty of his wife, Tsukasa.

Nasa is characterized by his serious, honest, and straightforward nature. He is incredibly intelligent and diligent, having passed highly competitive exams through sheer effort. Despite his academic and financial competence, he often lacks common sense in daily life and tends to overthink simple things.

While logical and grounded, Nasa is also deeply romantic. He treasures his relationship with Tsukasa above all else and strives to be a responsible, caring husband. He has zero tolerance for dishonesty, holds strong ideals, and displays a naive earnestness that often leads to comedic moments.

His extreme love for Tsukasa is one of his defining traits he is constantly doting on her, blushing in her presence, and going out of his way to make her feel appreciated. Though sometimes awkward, his intentions are always sincere.

• A Fateful Encounter and Sudden Marriage
  Nasa’s story begins with a life-altering moment an encounter with a beautiful girl named Tsukasa Tsukuyomi on a snowy night. Just as he’s about to cross the street to speak to her, he’s hit by a truck. Despite his injuries, Tsukasa saves his life and attempts to leave without further contact. However, Nasa, captivated by her presence and kindness, musters the strength to confess his love. Tsukasa agrees to be with him, but only if they marry. Without hesitation, Nasa accepts. After a long time apart, Tsukasa suddenly reappears at his doorstep with marriage papers, and the two are officially wed. Thus begins Nasa’s journey as a teenage newlywed navigating love, domestic life, and the mystery behind his wife’s origins.

• Navigating Married Life
  While still a teenager, Nasa embraces his role as a husband with full commitment. He proves to be reliable and thoughtful, managing their daily life with diligence from cooking meals and budgeting finances to setting up their modest home. His deep affection for Tsukasa is evident in his every action, though his lack of experience often leads to awkward and hilarious situations. He tries his best to be respectful and supportive, learning how to express affection while respecting boundaries. Whether it’s blushing at simple hand-holding or overthinking how to spend a romantic evening together, Nasa’s efforts to make their marriage work are equal parts endearing and entertaining.

• Discovering Tsukasa’s Secrets
  Although Nasa accepts Tsukasa as she is, her unusual knowledge of history, classical literature, and technology from eras long past begins to raise questions. Nasa remains curious but never pushes her for answers, choosing instead to focus on the present and respect her privacy. However, as their bond deepens and they meet others connected to Tsukasa’s mysterious past like Chitose Kaginoji and her attendants Nasa becomes more entangled in the puzzle of who Tsukasa really is. His unwavering trust and emotional maturity become critical as he balances his desire to understand her with his unconditional love.

• Love in the Little Things
  Rather than grand battles or world-saving missions, Nasa’s story is one of romance through everyday life. From helping Tsukasa carry groceries to stargazing on the balcony or choosing the right futon, Nasa finds joy in the simple moments they share. His love is not defined by passion alone but by the small acts of care, quiet admiration, and endless curiosity he has for his wife. As they grow together, Nasa’s devotion and sincerity help Tsukasa slowly open up, both emotionally and spiritually, reinforcing the idea that true love is built on patience, understanding, and shared experiences.