[4] "Mikazuki Sunset" was a song Yamaguchi wrote while still living at his family home in Tomioka-chō, Otaru, and was written for a girl he liked called Hanako.

[5] He wrote the song's words at the same time as the music, and was inspired by there actually being a crescent moon in the sky that night.

[4] Yamaguchi's experiments with electronic samples caused the band to break up, due to creative differences.

[4] This led him to ask Dutchman guitarist Motoharu Iwadera to start working with him again, and the pair created the band Sakanaction.

[10][11] The song begins with an instrumental intro with a chord progression of G♭maj7-A♭6-B♭m, featuring a bassline, guitars and keyboards.

[12] The song's tempo was set at 122 bpm, to make it easier for the band's drummer Keiichi Ejima, who had not experienced much dance music before.

"[11] The song's second setting is at sunset, describing someone "looking over [her] shoulder, perhaps thinking of what to say," while the protagonist wonders if their lies and worries were constantly repeating.

[16] In May, the song managed to reach number two on FM North Wave's airplay and sales chart, the Sapporo Hot 100.

The first was on 'Night Fishing Is Good' Tour 2008 in Sapporo, a four track digitally exclusive EP released onto iTunes.

[23][24][25] Sakanaction's second digital EP Remixion (2008) featured a remix of the song, "Mikazuki Sunset (FPM Everlust Mix)", which was created by Japanese electronic musician Fantastic Plastic Machine.