Sōhei Fujii, a transfer student drawn to Yuki’s enigmatic presence, evolves from a curious classmate into her steadfast confidant. His sharp intuition detects her animalistic scent and subtle quirks, sparking an investigation that culminates in Yuki’s wolf form accidentally wounding him. Despite the injury, he shields her with a fabricated story about a wild wolf, cementing their fragile trust.

Growing up in a fractured family, Sōhei grapples with isolation after his mother’s remarriage and impending half-sibling. This fuels his resolve for independence, manifesting in aspirations to box or wrestle and wistful musings about a "lone wolf" existence. His yearning for self-reliance mirrors Yuki’s conflict with her hybrid identity, forging a bond steeped in shared alienation.

Trapped together during a storm, Sōhei confesses his sense of displacement, prompting Yuki to unveil her secret. He reveals his prior suspicions, pieced together through careful observation, and swears unwavering secrecy. This exchange highlights his loyalty and empathy, deepening their connection.

Balancing humor with introspection, Sōhei masks his vulnerabilities behind lighthearted banter while contemplating familial estrangement and his uncertain future. His protective instincts emerge in defending Yuki against societal judgment, their friendship tinged with unspoken romantic tension during moments of shared vulnerability.

As Yuki’s tether to humanity, Sōhei encourages her to reconcile her wolf heritage with human normalcy. Their stormy pact to flee together echoes themes of belonging, ultimately influencing her choice to embrace her human side. His journey—marked by resilience, adolescent complexity, and quiet defiance against abandonment—parallels and complements Yuki’s own struggle for self-acceptance.