Inoue Kaoru
Arimatsu sought to work for politician Inoue Kaoru who was a founding member of the Doitsugaku Kyōkai Gakkō college he graduated, and was hired as a reporter for "Jiji Shimpō" (Autonomy News), a newsletter Inoue published before organzising autonomy party Jichitō. Two years later, Inoue failed to found Jichitō and the magazine was discontinued, when Minister of Justice granted Arimatsu an opportunity and appointed him a judge. Arimitsu's outstanding accomplishment promoted him to the post of Counsellor, Department of Justice in November 1892.