The name Mobekimasu had previously been used as the title of the Hello! Project 2010 Winter concert. The concert was announced on August 14, 2009 (though the title wasn’t made public until September 25, 2009). By the time Hello! Project Mobekimasu was announced in August 2011, fans were already familiar with the name.
Hello! Project Mobekimasu is a supergroup that had 33 members and 1 leader.