In 1928, Chūō Kōron sponsored a round-the-world trip for Hasegawa, together with his wife, lasting for one year, in exchange for essays and stories set in each port of call. The couple visited fourteen countries, and during this time, Hasegawa used the pen-name , to write true-life mystery novels, and stories about sophisticated city life in Tokyo and other locations, which drew in a large female fan base. His wife also wrote articles about London and Paris during this trip, which were published in the women's literary magazine Fujin Kōron (Women's Review).
