Osshoi!

 is the major debut (second overall) single by Batten Shoujo-tai. It was released on April 20, 2016, and peaked at #10 on the Oricon single chart.

Limited Edition A CD

 * 1) Osshoi! (おっしょい!)
 * 2) Shittocchan (知っとっちゃん)
 * 3) Osshoi! (instrumental)
 * 4) Shittocchan (instrumental)

Limited Edition B CD

 * 1) Osshoi!
 * 2) Shittocchan
 * 3) Izayuke Wakataka Gundan (いざゆけ若鷹軍団)
 * 4) Osshoi! (instrumental)
 * 5) Shittocchan (instrumental)
 * 6) Izayuke Wakataka Gundan (instrumental)

Regular Edition CD

 * 1) Osshoi!
 * 2) Shittocchan
 * 3) Sayonara DESTINY (さよなら DESTINY)
 * 4) Osshoi! (instrumental)
 * 5) Shittocchan (instrumental)
 * 6) Sayonara DESTINY (instrumental)