Ryuusei / Yakusoku

Ryuusei / Yakusoku (流星／約束; Meteor / Promise) is the fourteenth single (sixteenth overall) by Aoi Eir. It was released on June 13, 2018, with "Ryuusei" and "Yakusoku" as the single's lead tracks. It was released in three editions: a regular CD edition, a limited CD+DVD+Photbook edition, and a limited CD+DVD anime edition.

Information
This single marks the end of the hiatus of Aoi Eir started in November 2016 after the release of her two best albums BEST -E- AND BEST -A-.

The song "Ryuusei" was used as the opening of the anime Sword Art Online Alternative Gun Gale Online.

The short version of the music video for the song "Yakusoku" was released on February 07, 2018.

The limited anime edition is only available until September 2018.
 * Lyrics: Aoi Eir, Tsunami Kohei
 * Composition and arrangement: Tsunami Kohei
 * Catalog Number:
 * VVCL-1255 (Regular Edition)
 * VVCL-1252~4 (Limited Edition)
 * VVCL-1256~7 (Anime Edition)
 * Distributor: Sony Music Entertainment Japan

Regular / Limited Edition

 * 1) Ryuusei (流星; Meteor) - 4:13
 * 2) Yakusoku (約束; Promise) - 4:47
 * 3) Hitokakera no Yuuki (ヒトカケラの勇気; A Piece of Courage) - 3:52
 * 4) Ryuusei -Instrumental- - 4:11

Anime Edition

 * 1) Ryuusei (流星; Meteor) - 4:13
 * 2) Yakusoku (約束; Promise) - 4:47
 * 3) Hitokakera no Yuuki (ヒトカケラの勇気; A Piece of Courage) - 3:52
 * 4) Ryuusei -TV size ver.-

Limited Edition

 * 1) Ryuusei (Music Video) (流星 (ミュージックビデオ収録))
 * 2) Yakusoku (Music Video) (約束 (ミュージックビデオ収録))

Anime Edition

 * 1) "Sword Art Online Alternative - Gun Gale Online" Non-credit OP Video recording (「ソードアート・オンライン オルタナティブ ガンゲイル・オンライン」ノンクレジットOP映像収録)

Oricon Chart Positions
The single reached the eighth position on the Oricon weekly single chart and charted for a total of four weeks.

Recording Industry Association of Japan (RIAJ) Certifications
The song "Ryuusei" was certified gold on June 2018.