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- His real name is Muroo Terumichi, and he was born as the illegitimate child of an ex-samurai and a maid. His birth father was embarrassed and left the infant at a nearby temple. Saisei was then raised by the priest and his wife.
- Saisei left elementary school without graduating. Despite this, Saisei began writing haiku at fourteen. A piece was published in a Tokyo literary journal in 1906, and he was praised by the editor of Shinsei for a poem in the following year. Saisei decided to become a poet, and for the next few years, was active in poetry circles in his native Kanazawa. He wrote modern poetry, haiku, and tanka.
- Saisei worked as a page in a local court, and also worked as a journalist in 1909. He then left the next year to Tokyo, encouraged by Kitahara Hakushuu to write for the senior poet's magazine, Zamboa.
- Hagiwara Sakutarou was so impressed by Saisei's poetry (published in March 1913 issue of Zamboa) that he invited him to Maebishi. They met the next year in 1914, and Sakutarou was put off by Saisei's coarse and brash demeanor, expecting instead a delicate man. Saisei thought Sakutarou was pretentious. However, their friendship was long and fruitful, and quickly grew close in the following months. They founded a magazine, Kanjo, together, along with Yamamura Bocho, in 1916. Saisei later described his relationship with Sakutarou as that of "two souls in one body" in a poem for Hagiwara.
- Saisei veered from writing poetry and instead started to write prose. He became remembered more for his novels and fiction, rather than his poetry. His stories were successful, such as Ani Imouto (Brother and Sister, 1934) which created a sensation when first published.
- He died at age 73 due to lung cancer.
- At an event to commemorate the publishing of the poetry magazine "Japan's Poets", a man named Jun Okamoto began to find fault with Hagiwara Sakutarou, who was standing to give a speech. At this, Muroo began to swing around a chair. A few days later, Akutagawa Ryuunosuke sent him a letter with a short ode to him which basically said, "You swing that chair, Muroo!"
- Keene, Donald. Dawn to the West: Japanese Literature of the Modern Era, Volume 2.
- 文豪たちの友情, TL: https://kara-no-ai.tumblr.com/post/174101816915/muroo-saisei-hagiwara-sakutarous-friendship