Kinoshita began his professional career in 2015 with the Tokushima Indigo Socks of the Shikoku Island League Plus.

[2] On 20 October 2016, Kinoshita was selected as the 1st round development draft pick by the Chunichi Dragons at the 2016 NPB Draft and on 9 November signed a provisional contract with a ¥2,000,000 sign-on bonus and a ¥3,000,000 yearly salary.

[3] On 23 March 2018, Kinoshita was upgraded to a fully rostered contract and presented with the number 98.

[4] Kinoshita collapsed due to cardiopulmonary arrest[5] on 6 July 2021, during rehabilitation training on his right shoulder at Nagoya Stadium and was rushed to the hospital, where he was put on a ventilator.

There was some media speculation that his death was connected to his having received his first dose of a COVID-19 vaccine eight days prior to his collapse, but no such causal link has been established.