On April 6 , 2011 , the group released their third Japanese single , " Jet Coaster Love " , after the original release date was pushed back due to the 2011 Tōhoku earthquake and tsunami . The single debuted at number one on '' Oricon '' s Weekly Singles Chart with 122,820 copies sold on its first week . It also peaked at number two on '' Billboard '' s Japan Hot 100 . Despite its success , plans for promotion in Japan were hindered due to the natural disaster . Instead , the group announced that all proceeds from the single will be donated to Japan 's natural disaster relief aid . On June 22 , the group released their fourth Japanese single , " Go Go Summer ! " . The single debuted at number two on '' Oricon '' s Weekly Singles Chart with sales of 113,873 copies sold on its first week . The song became the group 's second single to sell over 100,000 copies on its first week
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Kara (South Korean group)