only my railgun is the seventh song covered by Poppin'Party, and was originally sung by FripSide.
It was first announced on August 21, 2017 and relased in the Japanese official Bang Dream Game server the same year, and also available in all the servers of the game.
A full version of the cover was later inserted in BanG Dream! Girls Band Party! Cover Collection Vol.3, relased on December 18, 2019.