TV-Series
Description
Initially perceived as a conventional romantic interest, Shinobu demonstrates notable patience and emotional resilience in response to Benio's active resistance to their engagement. He repeatedly intervenes during her public mishaps, such as bicycle accidents and kite-flying incidents, before their formal introduction. When Benio attempts to sabotage the arrangement through deliberate failures in domestic duties and public embarrassment tactics, he responds with consistent forgiveness and understanding, acknowledging her discomfort while maintaining his commitment.

His military service becomes pivotal. After provoking a superior officer, Shinobu faces reassignment to active duty in Manchuria and Siberia. Severely injured during deployment, he develops amnesia and assumes the identity of a Russian noblewoman's deceased husband. Believing himself married to Larissa during this period, he remains unaware of his past with Benio, introducing emotional complexity.

Shinobu's interpersonal dynamics extend beyond the central romance, showing loyalty to his comrade Onijima and unwittingly becoming an object of affection for Benio's friend Tamaki, though he maintains appropriate boundaries. His relationship with Benio evolves from obligation to genuine affection, marked by moments of shared defiance against social norms, such as collaborative public disturbances contrasting with his typically reserved military demeanor.

The resolution of his arc varies across adaptations. In the original manga and full cinematic versions, the 1923 Great Kantō earthquake catalyzes his reunion with Benio. Larissa perishes protecting him during the disaster; with her dying words, she releases Shinobu from their perceived marital bond, restoring his autonomy. Severely injured but mentally clarified, he locates Benio amid the devastation, leading to their mutual vow of permanent commitment. An alternative interpretation in the truncated 1978 anime omits the earthquake, concluding instead with Shinobu's physical recovery and memory restoration in Siberia, followed by an emotional reunion with Benio.

Throughout all iterations, Shinobu maintains core traits: unwavering emotional support for Benio's self-determination, quiet resilience in adversity, and a capacity for forgiveness facilitating their eventual partnership. His military background and bicultural heritage inform his worldview, though these remain secondary to his function as a stabilizing force within Benio's journey.