Sakutarō Hagiwara emerges as a significant literary figure, rooted in his historical role as a foundational modern Japanese poet celebrated for works like "Tsuki ni Hoeru" ("Howling at the Moon"). His character is defined by an intense bond with fellow writer Murō Saisei, characterized as "two souls in one body," mirroring their documented close friendship and collaboration founding the poetry magazine *Kanjou* in 1916.

Deeply impressed by Saisei's poetry in *Zamboa*, Hagiwara invited him to Maebashi in 1914. Their first meeting yielded mutual disillusionment: Hagiwara found Saisei's coarse demeanor jarring against his poetic sensitivity, while Saisei deemed Hagiwara pretentious. Despite this rocky start, their relationship transformed into fierce loyalty. Hagiwara's protectiveness manifested when he defended Saisei's honor at a literary event; reportedly swinging a chair at a critic who disparaged Saisei during a speech—an act later acknowledged in a humorous ode from Akutagawa Ryūnosuke.

Hagiwara's character incorporates his historical homosexuality. Narrative elements include his documented admission of being "briefly in love" with Saisei, adding complexity to their depicted relationship. Recollections and interactions subtly imply romantic undertones beneath their artistic camaraderie.

Beyond Saisei, Hagiwara stands as a respected figure among writers, his influence noted on contemporaries like Nakano Shigeharu and Miyoshi Tatsuji, underscoring his literary legacy. He consistently appears as protective and passionate, whether advocating for peers or confronting perceived slights, blending artistic refinement with volatile loyalty anchored in historical accounts.