• Acted for an American manufacturer in a major ICC arbitration against a Japanese company arising out of a licensing agreement relating to trade secrets
• Defended two Asian companies in JCAA arbitration from claims of approximately JPY10 billion brought by a Japanese multinational company
• Won damages award for a large US multinational in JCAA arbitration against a Japanese company arising out of breaches of a distribution and licensing agreement
• Successfully represented global manufacturing companies in parallel court proceedings in a Japanese court in relation to a dispute arising from a licensing agreement subject to arbitration
• Represented several major consumer finance companies in nationwide mass consumer litigation in Japan. Won two Japanese Supreme Court decisions in 2011 and two Japanese Supreme Court decisions in 2017
• Supreme Court Judgment of March 22, 2011, 236 shumin 225
• Supreme Court Judgment of July 8, 2011, 237 shumin 159
• Supreme Court Judgment of July 24, 2017, 71 minshu 6-969
• Supreme Court Judgment of December 19, 2017, H28 ju 1797
• Defended a global network service provider in a Japanese litigation from Internet-related copyright infringement claims brought by major Japanese content providers
• Acted for a multinational Internet security company in several Internet-related copyright infringement and defamation lawsuits in Japan brought by Japanese individual right holders
• Successfully settled a labor tribunal case before the Tokyo District Court between a leading financial institution and its former employee
• Represented a global pharmaceutical company in labor disputes before the Tokyo Metropolitan Government Labour Relations Commission and the Tokyo District Court concerning dismissal of employees
• Acted for a global consulting firm in a business dispute with a Japanese company arising from an outsourcing agreement
• Successfully settled a dispute arising out of a mega solar project in Japan in favor of an American solar mounting system manufacturer through a construction mediation before a Japanese court
• Advised a Japanese group company of a multinational financial institution on its application for reexamination before the National Tax Tribunal in Japan concerning its secondary tax liability
• Achieved a complete victory for a global real-estate investment management and advisory firm in two Japanese litigations concerning its collection of the asset management fees of more than JPY 500 million arising out of a real-estate investment deal involving a complex taxation scheme
• Served as Japanese law assistant for the sole arbitrator in an ICC arbitration seated in Tokyo in relation to an international trade dispute between a Japanese and Korean company governed by Japanese law

• Represented two Asian companies in a motion to set aside a JCAA arbitral award before a Japanese court
• Acted for a Japanese auto components supplier in a US litigation brought by a US government agency alleging claims of US$175 million
• Represented a Korean electronic equipment manufacturer in a US patent infringement litigation brought by a Japanese patent troll
• Counsel for an executive of a leading Japanese manufacturing company in connection with US Department of Justice antitrust investigations

Prior to joining O’Melveny, Hiroko worked for Mizuho Bank, Ltd. In addition to her current practice, Hiroko is actively involved in O’Melveny’s pro bono program. She has represented a variety of matters including the following:

• Advised a Hiroshima-based not-for-profit organization on copyright law issues involved in a multilingual bibliographic database concerning atomic bomb literature
• Assisted Iraqi and Columbian asylum applicants with refugee applications in Japan in cooperation with the Japan Association for Refugees
• Represented a not-for-profit organization in the establishment and organization of microfinance funds targeting development projects in Cambodia and Vietnam