TV-Series
Description
Luke Ainsworth spent his childhood at his father Basil's smithy on the outskirts of Housman's seventh district, training in blacksmithing and forming a close bond with his friend Lisa Oakwood, who dreamed of knighthood. Three years before the main events, he forged a katana for Lisa, believing it imperfect. While exploring nearby caves awaiting Basil, they encountered the bound demon Valbanill. The creature attacked, killing Basil and Lisa. In her final moments, Lisa Oakwood enacted a death spell contract, merging her body and spirit with Valbanill's blood and Luke's severed left eye to birth the demon Lisa. Luke survived as the sole witness.

Inheriting the smithy after the tragedy, Luke renamed it Atelier Lisa. He lived there in relative isolation with the newly created Lisa, who became his assistant and surrogate sister. He practiced his craft, taking on odd jobs and repairs for the citizens of the Independent Trade Cities. Representatives from major powers later revealed an impending crisis tied to Valbanill's weakening seal. They tasked Luke with forging a sacred sword to reinforce or replace the seal, leveraging his family's swordsmithing legacy.

Initially private and detached, Luke resisted outsiders involving themselves in his life with Lisa. He displayed irresponsibility, skipping crucial meetings. Though projecting indifference, he harbored deep concern for Lisa, willing to die to protect her. Yet he struggled to grasp her emotional needs, evident during shopping trips. His early interactions with knight Cecily Campbell involved criticizing her skills and reluctance to engage, though he repeatedly saved her in combat, establishing a pattern of concealed care beneath a brusque exterior.

Luke's combat prowess centered on katana proficiency, employing a unique fighting style. His artificial left eye and partnership with Lisa enabled the "forging spell," a magical process creating potent but temporary katanas in battle. This required verbal commands and material manipulation within a magical sphere, exacting a physical toll—aggravating wounds and posing lethal risks if used while severely injured. The swords were powerful but fragile, disintegrating after limited use.

His character evolved through relationships. Cecily's persistent empathy gradually lowered his defenses. After she questioned Lisa's happiness, Luke became more attentive to Lisa's daily joys, buying her a festival outfit and matching hat. His bond with Cecily deepened through shared conflicts against demon-contracted foes like Jack Strader and Charlotte Firobisher's bodyguards. During a pivotal meeting with world leaders, Cecily defended Luke against accusations about Lisa Oakwood's death, strengthening mutual trust. Luke later confessed Valbanill's imminent return to Cecily, inviting her to a high-stakes summit. He symbolized their deepened connection by placing a flower in her hair at Lisa Oakwood's grave.

A major turning point occurred when an unhuman attack drove Lisa, Cecily, and Aria into a ravine. Fearing their loss, Luke threw down a sword to aid their defense. After their rescue, he affirmed his acceptance and love for Lisa as her own person, distinct from Lisa Oakwood. His protective instincts surged during conflicts with Siegfried, who threatened to dissect Lisa for research on Valbanill's blood within her. Luke challenged Siegfried to a lethal duel, wagering Lisa's demon body, and sustained injuries dislodging his artificial eye.

Burdened by guilt over Lisa Oakwood's death, believing his actions led to her sacrifice, this trauma initially hindered his ability to forge the perfect sacred sword. Over time, he reconciled with the truth: Lisa Oakwood chose the demon contract out of love to protect him. His relationship with Lisa evolved into mutual devotion, promising they would stay together forever. His feelings for Cecily grew into romantic love, culminating in marriage. Centuries later, Lisa remained unchanged, serving as guardian and teacher to their descendants while overseeing the creation of the sacred sword that freed Aria from her sealing role.