Formation story: Vo.Gara and Gu.Yuu get into contact with each other over the phone after both of their bands disband. During this process, the rest of the members -- Gu.Kenichi, Ba.Tetsu, and Dr.Nero -- are recruited in the band.
Merry (メリー) officially forms.
A series of secret lives is held in Tokyo (東京)東京 and Nagoya (名古屋).
Merry holds their first official live.
Merry's independent record label, Gekiyaku RECORD (劇薬レコード), is formed. The band officially begins activities.
Merry holds their first oneman live, ~HARENCHI Gakuen~ (~ハレンチ学園~).
Alter-ego SUPER MERRIES (スーパーメリーズ) holds their first live.
MERRY's official fanclub "CORE" is established.
MERRY is forced to stop a fanclub-only live event after Vo.Gara suffers an accident and injures his back. Because of this, the band is forced to postpone several live dates, including a European tour scheduled for May.
MERRY signs with Free-Will.
MERRY temporarily goes on hiatus in order for Vo.Gara to focus on recovery after surgery on his herniated disk.
MERRY resumes activities.
Short tour "SYSTEM M-OLOGIE Extra ~Tetsu revenge~" (システム エムオロギーExtra~テツ revenge~) begins.
Tour "MERRY Autumn Tour 2018 「哀愁のダンスホール[羊想]異形 tiki」" (Aishu no DANCEHALL [Hitsuji sou] Igyou tiki) begins.
MERRY changes their notation back to Merry (メリー).