On/Off (stylized as ON/OFF) is a Japanese Jpop duo which consists of twin brothers, Naoya Sakamoto (坂本 直弥, Sakamoto Naoya) and Kazuya Sakamoto (坂本 和弥, Sakamoto Kazuya). The duo debuted in 2007 releasing the single "Eien no Setsuna" (永遠の刹那, "Eternal Moment").