(一生に一度のワープ Ver., (Isshō ni Ichido no Wāpu Bājon, "Once in a Lifetime Warp Version") found on Radwimps 4: Okazu no Gohan.

[4] According to vocalist and songwriter Yojiro Noda, "Futarigoto" along with the band's next single, "Yūshinron", took an amazing amount of effort to create.

[5] "Futarigoto" was written and recording sessions for it began even before Radwimps 3: Mujintō ni Motte Ikiwasureta Ichimai was released.

[6] The song initially came simply, and it was intended to be on the album, however the band members could not work out how to finish it.

[6] The band's 2009 album, Altocolony no Teiri, features an answer song to "Futarigoto," called "Märchen to Gretel."

review of the song noted "wonderful growth" with the release after the band's album Radwimps 3, and felt the lyrics had a "unique point of view," that listeners could spontaneously laugh and cry to.

The reviewer felt the lyrics were a fusion of humorous and romantic, and of straightforward feelings about youth and love.