Sekai was born on February 21, 1991, in Hayama, Kanagawa. His mother was an actress of Takarazuka Revue and ran a dance class after she quit. Growing up in a surrounding full of dance, Sekai started dancing at the age of 2 under the influence of his mother and the dance class. [6][7]Meanwhile, he also developed his enthusiasm towards animes, mangas, and games while watching animes on TV, as he had to spend a lot of time by himself without siblings to play with. [8]He took the audition of Shiki Theatre Company after watching their famous Lion King, and he passed it to become their young Simba in the musical. He played the role for about 3 years, from his grade four in elementary school to grade 1 in junior high school.[6][7][9]
After High School, Sekai went to New York to improve his dancing, while looking for a way to become a professional dancer.[10] He was in the Top 4 at the dance event "Step Ya Game Up 2010" held in New York in 2010. As he returned to Japan, he began to serve as a backup dancer for various artists. In 2010, he took part in Miriam Yeung's World Tour Live "Ladies&Gentlemen" in Hong Kong as a backup dancer. He also served as a backup dancer for Daichi Miura in 2011 and for Ketsumeishi in 2011 and 2013 at their tours, and he appeared in Daichi Miura's "Shout It -Live Edition-". In 2012, he won at the hip hop section of "Step Ya Game Up 2012".[6]
Career
In February 2014, he participated in "Exile Performer Battle Audition" held in order to find new performers for Exile, and on 27 April of the same year, he was chosen as one of the five Exile's new performers during the final held in Nippon Budokan[11].
On 29 December 2016, he was announced as a member and leader (alongside Exile's member Taiki Sato) of the unit Fantastics from Exile Tribe which released their major debut single "Over Drive" on December 5, 2018[12].
On 4 July 2019, after the first day's performance of "Battle Of Tokyo-Enter The Jr. Exile-" he was diagnosed with a metatarsal bone fracture due to which he couldn't appear on the stage in the following 3 days.[14]