"Akai Ito" (赤い糸 "Red Thread") is a pop song by Japanese recording artist Yui Aragaki.

[1] "Akai Ito" is a cover of one of Kobukuro's lesser known songs from their independent releases.

[2] Kobukuro's team wanted to bring focus to the song once again and suggested to the band they have a female vocalist cover it.

[2] Aragaki's version was subsequently produced by Tokyo Jihen member Seiji Kameda.

[4][5] The song debuted at #1 on the Billboard Japan Hot 100, making it her second consecutive number-one debut on this chart[6] "Akai Ito" was the 15th best selling single for the month of October and ranked #120 on the yearly Oricon singles chart.