Wonderful World / Ça va ? Ça va ? (Wonderful World / How are you? How are you?) is Juice=Juice's 6th major single. It was released on April 8, 2015 in 6 editions: 2 regular and 4 limited editions. The first press of the regular editions comes with a random trading card of 6 kinds depending on the jackets (12 in total). It became the group's first single to reach #1 on the Oricon charts, selling 34,127 copies in its first week.