"Sekai Eiyushi" (世界英雄史, lit. "World History of Heroes") is Pink Lady's 18th single, released on May 21, 1980. At the time of the single's release, the duo returned to Japan after failing to make a mark in the U.S. with their ill-fated variety show. At the same time, rumors started circulating about Pink Lady's disbandment, which was denied by the duo until they made an official announcement in a press conference on September 1.[1][2]