[14] Under the conscription system for university-students during World War II called Gakuto shutsujin (学徒出陣), Otohiko Hara joined the Imperial Japanese Navy, following Vice-Admiral Minoru Tayui [ja],[15][16] who was said to have a "Head like a Hammer", and was also from Akasaka-juku, in Gifu prefecture, and graduated from the Naval Academy summa cum laude.

He had to fly to Brazil by making international connections in many cities at that time and to start from scratch, residing in São Paulo with his wife, Yuhiko Hara, and his son, Hideroku Hara [ja],[25][26] to lay the foundation for Dai Nippon Spinning's (later, Unitika) starting up activities overseas ahead of other Japanese corporations, for instance, by joining Club Athletico Paulistano, the oldest sports and social club in Brazil, for building up a network of connections.

In 1958 Nichibo Brazil was established as the first overseas expansion of Japanese corporations after World War II with the financial support of The Sumitomo Bank when Kichihei Hara [ja],[27][28][29] who promoted volleyball actively at Nichibo Kaizuka factory (See 258 consecutive wins of Nichibo Kaizuka [:ja:]), which influenced the sports policy of Kaizuka City, and was later awarded the Grand Cordon of the Order of the Sacred Treasure in June 1975 for long-term distinguished service was the president of Dai Nippon Spinning then.

In 1960 when Otohiko Hara resided in Brazil, All-Japan Women's Volleyball National Team whose members were mostly Dai Nippon Spinning volleyball team players doing clerical work at Dai Nippon Spinning from 8 a.m. to 4 pm, called Oriental Witches [ja][31] led by Hirofumi Daimatsu [ja][32][33][34] who was also working for Dai Nippon Spinning Co., Ltd. then after graduating from Kwansei Gakuin University, became politician later, and still remains in the people's minds as "Demon Daimatsu", participated in FIVB Volleyball Women's World Championship held in Brazil, visited Otohiko Hara and encouraged each other.

In 1964 when the above-mentioned Oriental Witches [ja] won gold medal in Tokyo Olympics, Dai Nippon Spinning changed its name to Nichibo.