Morning Musume '15 DVD Magazine Vol.73 is a DVD magazine by Morning Musume '15. It was released on June 18, 2015 as merchandise for the Engeki Joshibu musical TRIANGLE. The selected members of Morning Musume '15 who perform in TRIANGLE are divided into the "Su" team and the "Wa" team and play games against each other! The losing team will receive a dreadful punishment game!