[1] Kawakami had a notable amateur career which saw him winning multiple titles including the Shoot Boxing All Japan in 2015. in 2016 he won the WBC Muay Thai All Japan Junior League title and was elected MVP of the event, as a reward he received a one-month trip to Thailand.
[2] Kawakami made his professional debut against Syuto Sato at SHOOT BOXING Osaka 2016 “Alpinisme vol.1” on August 13, 2016.
[4] Kawakami faced Kazuyuki Fushimi at SHOOT BOXING 2018 act.1 on February 10, 2018, in his first fight of the year.
[5] Kawakami next faced Jin Uehira at SHOOT BOXING Osaka 2018 “Alpinisme” vol.1 on March 18, 2018.
[6] Kawakami extended his winning streak to three consecutive fights with an extra round split decision win over Toshiyuki Nitamizu at SHOOT BOXING 2017 Young Caesar Cup Central 22 on May 20, 2018, in the quarterfinals of the Shootboxing bantamweight tournament.
[8] Kawakami was next booked to face Keito Naito at SHOOT BOXING Osaka 2019 “Alpinisme” vol.1 on August 10, 2019.
[15] Kawakami faced Kotaro Yamada at SHOOT BOXING 2021 Young Caesar Cup on December 19, 2021, in his first bout at the featherweight (-57.5 kg) limit.
The bout was postponed for KNOCK OUT 2024 vol.2 on April 27, 2024, as Ryusei withdrew due to illness on February 23.