Vamps hosted the VampPark Fest at the Nippon Budokan on February 18 and 19, 2015. In addition to themselves, it included , Buckcherry, Sads, Nothing More, Gerard Way and Alexandros. Vamps took part in the Japan Night event held in Jakarta on April 4, alongside several other artists promoting Japanese music. Beginning on April 8, they were a support act for twelve stops on Sixx:A.M.'s North American tour. They also performed at two festivals in Florida, the Fort Rock Festival on April 25 and Welcome to Rockville the following day, their own headlining show at the Best Buy Theater on May 1, and at the Rock on the Range festival on May 15. Vamps returned to South America for four concerts in late September and early October, before being a support act for six shows on Apocalyptica's UK tour in November. They released a collaborative single with Apocalyptica titled "Sin in Justice" on November 20.