TV-Series
Description
Jack is a male Labrador Retriever and a second-year student at Cherryton Academy. He stands 167 centimeters tall and is distinguished as the top student in his entire year, known for his diligence and intelligence. His friendship with the gray wolf Legoshi is the central relationship of his life, beginning from a childhood fight that unexpectedly forged a deep bond. Since that moment, Jack has taken on a role akin to family for the often misunderstood and solitary Legoshi, acting as a constant source of support and stability.

As a breed, Jack embodies the inherent contradictions of his world. Dogs were created as a "modified" species during the great war between herbivores and carnivores, engineered from wolf DNA to possess reduced aggression and higher intelligence. This heritage is a source of quiet turmoil for him. While outwardly cheerful, affable, and socially adept, Jack harbors well-concealed feelings of inadequacy and resentment toward "pure" wolves like Legoshi, whom he sees as a superior relative. This internal conflict intensifies as the story progresses, leading him to fear that his nature as a dog has corrupted his genuine emotions and blunted his capacity for empathy. In his most vulnerable moments, Jack admits he cannot cry honestly and resorts to peeling onions to force tears, a stark illustration of his deep-seated struggle to connect with his own feelings.

Within the chaotic events of the story, Jack serves as an anchor back to a normal, structured life. While Legoshi becomes consumed by his instincts and complex relationships, Jack remains focused on his studies, enjoys typical pastimes like watching movies with his dorm mates, and worries about everyday concerns like homework. Jack is often the one who voices the audience's concern for Legoshi, noting the weight of his friend's burdens and his terrifying appearance to others. Despite being afraid of seeing blood and often left in the dark about the specifics of Legoshi's dangerous life, Jack consistently provides unconditional support, a place to sleep, and a listening ear. His role is not that of a hero but of a loyal friend who ensures that Legoshi has a home to return to. He goes so far as to remain at school during holidays so that Legoshi will not be alone, and he cries when he senses their paths are diverging.

Jack’s development is a quiet, internal arc that fully surfaces when Legoshi leaves the academy. Facing a more advanced curriculum that teaches the unvarnished, grim history of carnivore-herbivore relations, Jack’s resilience is tested. He feels the oppressive weight of his species' artificial origins more acutely, yet he cannot bring himself to hate anyone for it. In a pivotal moment, he finally opens up to Legoshi about his philosophical despair, leading to a primal moment of pack bonding where Legoshi howls for him, reaffirming their connection. At the conclusion of the story, Jack uses his exceptional intellect to gain admission to a difficult university, where he intends to dedicate his life to the very science of dog breed改良 (improvement) that defines his existence, thus turning his life's central conflict into a purpose.