"Dōkoku" is the theme song of the CX getsuku television series Ano Hi ni Kaeritai,[1] starring Momoko Kikuchi and Kudo herself as two sisters who fall in love with the same man.

[5] In 2015, DAM asked their users to select their favorite Shizuka Kudo songs to sing karaoke to and compiled a top ten list; "Dōkoku" came in at number two.

Nakajima writes from the perspective of a woman coming to the realization that her feelings for a male friend have progressed beyond friendship, after "crying all night".

[7] Nakajima received acclaim for the storytelling abilities she demonstrates on "Dōkoku", and for weaving a story that is relatable to both women and men.

[9] In an interview with Excite, Kato praised the power of Nakajima's lyrics, stating "I really felt, by singing the song, that I had become the protagonist".

[10] In 2013, Kato performed the song, backed by Gotō, on the CX music show FNS Uta no Natsu Matsuri.