- In 1906, Mokichi met and bonded with Itou Sachio over drawing inspiration from Masaoka Shiki's style of writing. Sachio, himself a student of Shiki, acted as a mentor to Mokichi, offering words of encouragement and publishing Mokichi's works in his Ashibi magazine. 
- The two would later work on Araragi, another of Sachio's magazines. In 1909, however, Mokichi became afflicted with a severe case of typhoid fever that would affect his ability to write and study into the following year.
- This period of poetic inactivity resulted in a shift in writing style that Sachio did not entirely approve of. Though Mokichi continued to publish his works in Araragi, he was no longer praised constantly by Sachio for his efforts. The two began to fight over this and other poetic matters, but they would remain otherwise on friendly speaking terms until Sachio's death in July of 1913.
- Mokichi acted as family physician to Akutagawa Ryuunosuke, with whom he was also friends. It was Mokichi who perscribed pills when Akutagawa complained of sleeping trouble, only to later find that he used those pills to commit suicide via overdose. This left Mokichi, who was awfully repulsed by the idea of suicide, quite shaken.
- Mokichi was born into a family that raised silkworms for a living, but was not known to have helped much with this.
- Mokichi’s father developed chronic asthma some time before Mokichi’s birth; this, combined with his mother’s sensitivity to natural elements, left him slightly frail for much of his childhood.
- Buddhism served as a major source of inspiration for Mokichi throughout many aspects of his life and works, due to the time he would often spend in his village’s temple when he was younger. Mokichi studied extensively under the guidance of the temple’s priest, Sawara Ryuuou, who acted as mentor to Mokichi and whose influence, even outside of literary and religious matters, would remain with Mokichi for the rest of his life. Ironically, Mokichi himself was never a religious person.
- Fragments of Rainbows: The Life and Poetry of Saito Mokichi, 1882-1953, Amy Vladeck Heinrich, 1983.