Released in September 2016 as the lead track of his fifth single "LOSER / ナンバーナイン," Kenshi Yonezu's LOSER became one of the defining J-pop hits of the late 2010s. The song marked a shift in Yonezu's visual presentation, its official music video was his first to feature himself dancing, a move that drew widespread attention and helped push the video past 100 million views by July 2018 and 200 million by June 2019. The track also gained commercial exposure through a Japanese automobile commercial in 2018, further cementing its mainstream presence. LOSER arrived in maimai at the launch of maimai でらっくす (maimai DX) on July 11, 2019, classified under POPS & ANIME. Upon release, it carried a unique distinction: its Basic chart was the only Level 1 chart in the entire game, offering the gentlest possible entry point for new players. The Expert chart was designed by シチミヘルツ (Shichimi hertz), while the Master chart was designed by Jack. The song was later removed from the Asian version of maimai starting with maimai DX UNiVERSE and from the Chinese version (舞萌DX) beginning with the 2022 edition, though it remains available in the Japanese version.