Yakusoku (Eir Aoi song)
# Yakusoku (Eir Aoi song)

"Yakusoku" (約束, Promise) is a song by Japanese pop singer Eir Aoi. It was released on her official YouTube on February 8, 2018 as her comeback song from her hiatus, before received a physical release together with the song "Ryūsei" on June 13, 2018 as her fourteenth single. It reached number 8 on Oricon and number 10 on Japan Hot 100. The single mark as her first double A-side single.

## Release and reception

On 8 February 2018, it was announced that she would resume her activities after her hiatus with the release of the music video "Yakusoku" (約束, Promise) on YouTube. The song itself was released together with the song "Ryūsei" on June 13, 2018 as her fourteenth single on three edition; Regular edition, Limited edition and Limited anime edition. The single reached number 8 on Oricon, and 10 on Japan Hot 100. The song was featured in her fourth album "Fragment".

## Music video

The music video for "Yakusoku" was directed by Yūsuke Tanaka. The video features a lyrics of the song with some footage of Eir Aoi with using blue jacket taking a photo session in the mountain, with some scene featuring a forest and also a mountain

## Personnel

### Singer and bands

* Eir Aoi – vocals, lyrics ("Ryūsei", "Yakusoku")
* Kohei Tsunami, Ryosuke Shigenaga, Katsuhiko Kurosu – lyrics
* Ryosuke Shigenaga – Piano, arranger, other instruments
* Hiroki Arai - bass
* Takumi Sone – guitar
* Taro Yoshida – drums
* Tomoe Nakajima, Izumi Taniguchi, Nao Yamada - Violin, viola
* Kana Matsuo - Cello

### Production

* Satoshi Morishige, Nobuyuki Fujiwara – record
* Kenichi Koga – mixer

## Charts

| Year | Chart | Peak position (shared with Ryūsei) |
| - | - | - |
| 2017 | Oricon | 10 |
| 2017 | Japan Hot 100 | 8 |

## Release history

| Region | Date | Label | Format | Catalog |
| - | - | - | - | - |
| Japan | 13 June 2018 | Sacra Music | CD | VVCL-1255 |
| Japan | 13 June 2018 | Sacra Music | CD+DVD | VVCL-1252 |
| Japan | 13 June 2018 | Sacra Music | CD+DVD | VVCL-1256 |
