Sakutarō Hagiwara, born in Maebashi, rose to prominence as a significant literary figure beginning with his poetry. His work in the March 1913 issue of *Zamboa* attracted Murō Saisei, prompting Saisei's visit to Maebashi in 1914. Their first meeting surprised Hagiwara, who found Saisei unexpectedly coarse and brash, contrary to his anticipation of delicacy. Saisei, conversely, perceived Hagiwara as pretentious. Despite this initial discord, their relationship deepened rapidly into a profound and enduring friendship. Within months, they grew exceptionally close. They collaborated with Yamamura Bochō to establish the poetry magazine *Kanjou* in 1916. Hagiwara later encapsulated their intense intellectual and emotional connection poetically as "two souls in one body." Historical documentation aligns with suggestions Hagiwara harbored romantic feelings for Saisei.

Hagiwara's literary career commenced with poetry, exploring modern forms, haiku, and tanka, significantly influencing contemporaries like Nakano Shigeharu, Miyoshi Tatsuji, and Hori Tatsuo. He later transitioned to prose, achieving greater renown for his novels and fiction. His notable prose work *Ani Imouto* ("Brother and Sister," 1934) garnered considerable acclaim upon publication. This shift defined his career, solidifying his legacy primarily through narrative fiction.

Specific anecdotes illustrate Hagiwara's personality. During an event commemorating *Japan's Poets*, Jun Okamoto publicly criticized Hagiwara. Saisei reacted impulsively, swinging a chair in defense. This act prompted Akutagawa Ryūnosuke to send Saisei a letter humorously praising the outburst with the phrase, "You swing that chair, Muroo!" This episode highlights Hagiwara's influence and the fiercely protective nature of his literary circle.