Kagetsuya, a celestial operative from Eden, serves as a minus checker cataloging humanity’s flaws. Born to archangels Michael and Lucifel but abandoned in infancy, he was raised unknowingly by the Sakura nobility, molding him into a prideful enforcer of Eden’s hierarchies—including contempt for Earthians and bans on same-sex unions. His angelic form radiates with golden hair, piercing blue eyes, and luminous wings, though he adopts a human guise with trimmed locks and unassuming attire. Unique abilities include mending injuries through saliva, directing birds as scouts, and mastering international cuisines—skills leveraged to aid his conflicted partnership with Chihaya, whom he repeatedly rescues despite clashing ideologies.

Initially scornful of Chihaya’s dark wings and humanistic optimism, Kagetsuya’s icy demeanor thaws into forbidden affection. Their romance sparks a defiant courtroom confession where Kagetsuya proclaims their love, only to fracture when Chihaya disavows their bond for his protection. The betrayal plunges Kagetsuya into despondency, fueling reckless behavior. Torn between celestial duty and Chihaya’s influence, he increasingly subverts Eden’s mandates, shielding Earthians against protocol. When Eden condemns Earth to annihilation, he openly rebels, joining Chihaya’s resistance.

His loyalties face ultimate trials during confrontations with Messiah, a bio-engineered destroyer, where Kagetsuya intercepts lethal blows to protect Chihaya. Unbeknownst to him, his lineage as the secret offspring of rival archangels adds latent complexity, while unrequited feelings for Lady Gabriel—a married mentor—mirror his suppressed yearnings. Once rigid in doctrine, he gradually embraces vulnerability, sacrificing status and safety for love.

His arc crystallizes in acts of rebellion: enduring torture during Eden’s purges, publicly decrying the justice system, and shielding Chihaya at personal cost. Through these choices, he transforms from cold enforcer to emblem of dissent, his journey epitomizing the corrosive power of forbidden bonds and the radicalization sparked by love.