| Yokoku | |
| Cover: | Yokoku.png |
| Type: | Single |
| Artist: | Aiko |
| Label: | Pony Canyon |
| Producer: | Aiko |
| Prev Title: | Koi o Shita no wa |
| Prev Year: | 2016 |
is a song recorded by Japanese singer-songwriter Aiko. It was released as a single by Pony Canyon on November 29, 2017.[1] The song premiered on the JOLF radio program Takashi Okamura's All Night Nippon on November 2, 2017.[2] The song, written and composed by Aiko, is arranged by Oster, who is credited under the solo unit name Oster Project.[3] The first pressing of the CD single includes an eight-page booklet and alternative cover artwork.[4]
"Yokoku" is Aiko's first single in over a year, since "Koi o Shita no wa" (2016).[4] Aiko wrote the song to cheer herself up, intending for it to serve as a sort of personal anthem.[5]
With 26,000 copies sold in its first week, "Yokoku" debuted at number 3 on the Oricon Singles Chart,[6] becoming her third consecutive single to do so. "Yokoku" also became Aiko's thirty-fourth single to rank in the top ten.[7] The single charted for seven weeks on the chart and sold a reported total of 31,000 copies. The song also peaked within the top ten on Billboard Japans Hot 100 on its fourth charting week, jumping eighty-four positions from number 88 to number 4.
| Chart (2017) | Peak position | |
|---|---|---|
| Japan Weekly Singles (Oricon)[8] | 3 | |
| Japan Weekly Digital Singles (Oricon)[9] | 14 | |
| Japan Hot 100 (Billboard)[10] | 4 | |
| Japan Download Songs (Billboard)[11] | 18 | |
| Japan Top Singles Sales (Billboard)[12] | 4 |