[1] Kudo made her first appearance on the 39th Kōhaku Uta Gassen and performed "Mugon... Iroppoi" for the Red team.

Lyrically, Nakajima cheekily describes a bashful protagonist struggling to profess her feelings to the object of her affection, whose attempts at seduction are foiled by her cowardly silence, and pondering if "tomorrow will be the day I summon up the courage to finally glance your way".

[6] Nakajima and Gotō were praised for crafting a light pop song filled with pathos that has since become emblematic of its era.

Mizuki also performed a live duet of the song with Kudo in 2014 on the Fuji TV program Music Fair.

[10] It is her second consecutive number-one single, following "Fu-ji-tsu", and first to break the half a million total sales mark.