Twill

Twill (トゥワイル, Tuwairu) is a Japanese duo composed of twins Michiko and Yoko (surname unknown). Their stage name is a portmanteau of English language words "twin" and "will". They are managed by TV Asahi Music. They are also known in United States and Sweden. Two of their singles "New World" and "STAND UP" are used as opening themes for the Digimon Xros Wars anime series.