Elderly South Korean women that were forced into sex slavery by Japan during World War II arrived in Hiroshima Friday to hold a series of rallies to inform Japanese of the suffering caused by their ancestors, a Japanese news agency said. Their visit came amid repeated offensive remarks made by Japanese politicians that distort history. In the latest incident, Osaka mayor and co-leader of the conservative Japan Restoration Party Toru Hashimoto said that then sex slavery was \"necessary,\" claiming that other countries also had similar systems in place during war.