Before their debut, the group performed at a jazz cafe in Tokyo. With the performance of them falling off the stage and fainting because they were o enthusiastic during the show, it quickly became popular, especially fan girls. In May 1968, they made their record debut with "Girlfriend" (6th on the ). The group became poplar as Hideto Noguchi's sweet singing voice (who had joined the band in January) and Ai Akamatsu's fairy tale atmosphere attracted many girls and their popularity soared. Later, they released their many hit songs such as "Dancing Seventeen" (28th on the Oricon chart), "Tears of Swan" (7th on the Oricon chart) and "I'm On Fire" (18th on the Oricon chart) were skipped one after another, becoming a super popular group alongside and .