Zero, a thirteen-year-old wizard-in-training from an affluent family, enters the scene with striking aqua-blue hair and a volatile mastery of destruction magic. Born on August 10, his impatience and rebellious streak fuel frequent clashes, contrasting his privileged upbringing. His childhood intertwines with an arranged betrothal to Kuku, engineered by his parents, and a steadfast bond with his older brother Jeff, whose marriage to Sarasa—Ichî’s stepsister—anchors family ties. At ten, Zero’s recognition of Ichî’s latent magic sparks an alliance, driving them to enroll in a magical cram school to conquer the Magic Exams.

The exams pivot when Nina Yamada accidentally ingests the Crystal Pearl, binding Zero and Ichî to shield her for six months. Zero’s initial scorn toward Nina softens into reluctant affection, his sharp-edged demeanor masking growing vulnerability. Their turbulent rapport—marked by arguments and fragile trust—culminates in mutual romance. His loyalty peaks in a fatal sacrifice to save Nina from Joker, reversed only by her awakening magic.

By fifteen, Zero battles familial ultimatums: marry Nina to claim his inheritance or forfeit it. His grandmother halts the Magic Exams to enforce this, propelling him to seek the Stardust Stone and dismantle the contract. Amid trials, his bond with Nina deepens, their staged wedding clinching exam victory. Post-exams, he joins the Magical Police, sustaining a long-distance romance until reuniting with Nina in the human world.

A decade later at twenty-three, Zero proposes, later wedding Nina and fathering Rei and Mina. His arc spans brash youth to tempered maturity, balancing duty as protector, partner, and parent. His rivalry with Ichî mellows into camaraderie, forged by shared purpose and respect, closing the loop on a journey from impulsive wizardry to grounded legacy.