On February 3 , 2011 , Morning Musume 's 45th single , " Maji Desu ka Ska ! " , was announced . The single was set to be released on March 23 , 2011 ; however , due to the earthquake and tsunami in Japan , the single was postponed until April 6 . The new single reached number 5 on the Oricon weekly charts
earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Morning Musume