Kurutta Taiyou(狂った太陽,"Lunatic Sun"?) is the sixth studio album by the Japanese rock band Buck-Tick. It was released on cassette and CD on February 21, 1991 through Victor Entertainment. The album was digitally remastered and re-released on September 19, 2002, with two bonus tracks. It was remastered and re-released again on September 5, 2007. "M・A・D" and "Jupiter" were later re-recorded for the group's compilation album Koroshi no Shirabe: This Is Not Greatest Hits (1992). The album peaked at number two on the Oricon charts and has sold 320,000 copies worldwide.