Yoasobi announced their first English-language EP, titled
E-Side on October 29, 2021, the same day as "Blue" release, alongside its track listing, and cover artwork, scheduled for release on November 12 to
digital music and
streaming platforms only, as part of "Yoasobi Nice to Meet You Countdown" to announce the duo's new information every Friday for ten weeks until their one-off concert
Nice to Meet You. The cover artwork of
E-Side depicts a red
pixel art on the bottom of the gray background with darker gray pixels and places the duo's slogan "Novel into Music" below the EP's title, designed by Mina Sakurai. The EP contains four previous-release English songs, and four new English-translated songs: "
Haven't" from "Tabun", "
Comet" from "Yasashii Suisei, "
Encore", and "
Tracing a Dream" from "Ano Yume o Nazotte". The duo uploaded the EP's snippets as the "
crossfade movie" on November 7. The full song of "Comet", and "Tracing a Dream" were played for the first time at their radio show ''Yoasobi's All Night Nippon X'' on November 10, due to asking fans via Twitter poll. The accompanying music videos of the all new tracks were premiered alongside the EP release since midnight
JST. LED billboards for advertising the EP were also placed in
New York City,
United States. ==Commercial performance==