[5] Kobayashi was not a from Tōkai, but the residents were along the concept of the project, he was participated in the audition by the intention of the agency, he became an established member of Boys and Men.
For practice and performances appearance of the same work, Kobayashi was temporary suspended the activities of Boys and Men.
In November of the same year, his first solo debut was the single "Boku no sekai ga kawatte iku / seven colors ☆ love".
[12] In the same year, his first starring role in a television drama was Naze Todo-in Seiya 16-sai wa kanojo ga dekinai no ka?
Due to this, on April 8, 2022, Fortune Entertainment announced his departure from the company and idol group BOYS AND MEN.