ONE N' ONLY was originaly formed as project with the members of the two groups EBBiSH and Satori Boys Club under Stardust Records and EBiDAN. The group was at first only planned to be a one single-project with their song "I'M SWAG", but soon gained a lot popularity in Japan.
Besides this, member Naoya is the younger brother of Takuya from the boygroup BULLET TRAIN.
Debut and after:
Trought the popularity of their first single their agency than decided to debut the members of both groups as ONE N' ONLY on August 19th, 2018 but due to the release date of their first single a lot people think their actual debut date would be May 7th, 2018.
In December 2019 member Koki had announced to leave the group.
On January 21st, 2020 it was officialy announced that due to the activities of the group their previous groups EBBiSH and Satori Boys Club got dissolved.
Besides their work as musician the member are also heavly active on their group's TikTok-account wich gaint over 1.5 million follower