Japan debut single from AFTERSCHOOL. Limited Edition B includes "Bang! (Japanese Version)" and a Japan original song (song title is to be announced later). It also comes with a DVD including music videos for "Let's Do It! (Korean version)" and "Bang! (Korean version)" as well as a special message video in which members introduce themselves in Korean. A trading card is included (one design randomly selected from 10 kinds). Comes in a special slipcase. *The DVD disc is encoded for region 2 (Japan, Europe, and Middle East), and no subtitles are included.