"On/Off -Japanese Ver.-" is the debut Japanese single album by ONF. It was released on August 1, 2018 with "On/Off -Japanese Ver.-" serving as the single's title track.
The physical release comes in three editions: a regular CD edition and two limited CD+DVD editions. Each editions also include a randomly selected trading card among eight.
The songs "On/Off" and "Original" are the Japanese version of the songs featured respectively as the lead and fourth track on their debut mini-album On/Off.