Maware! Setsugetsuka (エイリアンエイリアン) is the 15th cover by Hello, Happy World!, and was originally sung by Utagumi Setsugetsuka.
It was first announced on December 8, 2018, and released in the Japanese official Bang Dream Game server the same year, and also available in all the other servers.
A full version of the cover was later inserted in the album Girls Band Party! Cover Collection Vol.3, released on December 12, 2019.