Two former "comfort women" and five civic activists left for a week-long visit to Japan Wednesday to protest the country's distortion of its history in textbooks recently approved for use in middle schools.

The delegation from the Korean Council for Military Sexual Slavery by Japan will visit the parliament's lower house Thursday for a meeting with lawmakers. On Friday, they will stage a demonstration inside the parliamentary complex in protest of the Education Ministry's approval of the textbooks in question early this month.

An official at the council said his council will sue five Japanese people, including Takao Sakamoto, the professor who linked the history of Asian comfort women to the history of toilets, for libel. He said the council is hiring a lawyer in Japan.

The official said the professor defamed former Korean "comfort women" who were forced to serve as sex slaves of the Japanese imperialist army during World War II.