Rash Behari's was initially educated at Subaldaha under the supervision of his grandfather, Kalicharan, and later in Dupleix College at Chandernagore. At the time Chandernagore was under French rule thus, Rash Behari was influenced by both British and French culture. The French Revolution of 1789 had a deep impact on Rash Behari. Rash Behari was not a very attentive student. He was a day-dreamer, his mind preoccupied with revolutionary ideas. He was more interested in his physical prowess than his studies.
Rash Behari got hold of a well-known revolutionary novel called "Ananda Math (Abbey of Bliss)" written by noted Bengali novelist, poet and thinker, Bankim Chandra Chatterjee. Rash Behari also read the famous Bengali poet, Navin Sen's, Plasir Yudha, a collection of patriotic poems. In course of time he read other revolutionary books. He read nationalistic speeches by orator and revolutionary, Surendranath Banerjea, and Swami Vivekananda. In Chandernagore, his teacher Charu Chand, a man of radical ideas, inspired Rash Behari along revolutionary lines.
Rash Behari did not get a chance to complete college because his uncle got him a job at Fort William. From there he transferred to the Government press in Shimla on his father's wish. He was appointed the copy-holder in the press and was able to master English and typewriting. After some time he moved to the Pasteur Institute in Kasauli. Rash Behari was not happy with these jobs.
On a colleague's advice, Rash Behari went to Dehra Dun as a guardian tutor in the house of Pramantha Nath Tagore. He got a clerical post at the Dehra Dun Forest Research Institute where through hard work, Rash Behari became a head-clerk.
Rash Behari remained on the move from Punjab to Uttar Pradesh to Bengal in different disguises. A police officer noted that Rash Behari could have been a "great stage actor" instead of a revolutionary if he so desired.
In the mean time Rash Behari came in contact with the Ghadar Party, and revolutionaries like Sachin Sanyal, Pingley and Satyen Sen and began planning an another armed uprising. The Ghadar Party was established in 1913 in U.S.A. by expatriate Indians who were sympathetic toward India's struggle. Sachin Sanyal was Rash Behari's right-hand man. He formed the Hindustan Republican Association and emerged as a great leader of the revolutionaries. The plan for the armed uprising was discovered. Sanyal was arrested and awarded transportation for life under the Benaras Conspiracy Case. Pingley, a Maharashtrian, was arrested with some bombs in 1915 and was executed. Rash Behari decided to leave India for Japan. He went to Benaras and stayed with Swami Vidyanand of Sandhya in a math.
Rash Behari left Calcutta on May 12, 1915. He went to Japan as Raja P.N.T. Tagore, a distant relative of Rabindranath Tagore. Some historians say that Rabindranath Tagore was aware of this impersonation. Rash Behari reached Singapore on May 22, 1915 and Tokyo in June. Between 1915 and 1918, Rash Behari lived almost like a fugitive, changing his residence 17 times. During this period he met Herambalal Gupta and Bhagwan Singh of the Ghadar Party. Japan was an ally of Britain's in the First World War and tried to extradite Rash Behari and Herambalal from Japan. Herambalal escaped to U.S.A. and Rash Behari ended his hide and seek by becoming a Japanese citizen. He married Tosiko, daughter of the Soma family who were sympathetic toward Rash Behari's efforts. The couple had two children, a boy, Masahide, and a girl, Tetaku. Tosiko died in March 1928 at the age of 28
Rash Behari learned Japanese and became a journalist and writer. He took part in many cultural activities and wrote many books in Japanese, explaining India's viewpoints. It was due to Rash Behari's efforts that a conference was help in Tokyo from March 28 to 30, 1942, for discussion on political issues. Another conference was held in Bangkok from June 15 to 23, 1942, where Rash Behari hoisted the Indian tri-color and inaugurated the Indian Independence League.