[7][8][9][10] Rhythm guitarist/vocalist Miku Kobato wanted to call it "Rule", but lead vocalist Saiki Atsumi felt that it was too pushy.

[8] Lead guitarist Kanami Tōno wanted "Manners" to have a Western feel to it, so she analyzed all the songs that were nominated for Grammy Awards.

[7] The title of "H-G-K" is a reference to a Turkish military guided bomb, HGK, as has been confirmed by lyricist Kobato in an interview.

[7] Hirose prepared seven different patterns of kick drum variations to show to her band members, with the level of difficulty ranging from "easy-peasy" to "hell".

[12] The album received generally positive reviews from music journalists familiar with the J-rock scene.

Carlos Vélez-Cancel at Everything Is Noise noted that the album is heavier than its predecessors, and praised the band's "ability to craft anthemic songs without being afraid to delve into the unconventional.

"[13] Raijin Rock also noted the album's lack of ballads when compared to the band's previous albums and its "absolutely furious and unabating assault of aggressive hard rock", along with guitarist Kanami Tōno's ability to write memorable riffs, concluding that the band "are more cohesive on Unseen World than in any previous release.