Nasa Yuzaki, originally named "Hoshizora" (starry sky) but pronounced like the American space agency, endured childhood mockery over his unconventional name, fueling a relentless drive to earn recognition through academic excellence. By middle school, he ranked first nationally in exams and set his sights on elite high schools until a fateful snowy night reshaped his path. Spotting a captivating girl across a street, he recklessly darted toward her, triggering a truck collision. The stranger, Tsukasa Tsukuyomi, miraculously saved him, sustaining injuries herself. Bleeding and barely conscious, Nasa chased her to a bus stop, blurting a marriage-fueled confession. She accepted on the condition they wed, leaving him collapsing into a coma. After recovery, he abandoned formal education for odd jobs, awaiting her promised return—a vow fulfilled two years later when she appeared with marriage papers. As a husband, Nasa balanced razor-sharp intellect with social clumsiness. His minimalist apartment prioritized utility, stocked with efficiency-driven items like nutritionally optimized hot pot ingredients. Though academically gifted, he stumbled through pop culture references and romantic cues, seeking advice from confidants like Kaname Arisugawa. His devotion to Tsukasa mingled with visceral fear of abandonment, prompting clinginess that gradually softened into trust. Adapting to married life, Nasa navigated shared routines—purchasing a second futon, adjusting sleep schedules—and initially equated love with tangible gestures, insisting on an expensive wedding ring despite Tsukasa’s indifference to price. Over time, he shifted toward valuing emotional sincerity, documenting her unfiltered reactions with quiet awe, cherishing her unguarded laughter or flustered blushes. Physically resilient, Nasa shrugged off grave injuries from their first meeting and habitually ignored ailments until Tsukasa intervened. Verbal missteps plagued him, his words often tangling into awkward declarations followed by frantic apologies. Yet his unwavering kindness anchored their bond, deepened through collaborative chores and camaraderie with neighbors like the Arisugawa siblings. Though Tsukasa’s cryptic past occasionally surfaced—historical knowledge, elusive remarks about her origins—Nasa focused on their present, weaving trust through daily acts of partnership. Their dynamic oscillated between comedic mishaps, like misread romantic overtures, and quiet resilience, each moment reinforcing loyalty over lingering mysteries.