Kosei Fujita is a Japanese professional wrestler signed to New Japan Pro-Wrestling (NJPW), where he is a member of The Mighty Don't Kneel (TMDK). He is a three-time IWGP Junior Heavyweight Tag Team Champion and the winner of the 2025 Best of the Super Junior tournament, becoming the youngest wrestler to win the tournament in its history.

Fujita joined the NJPW Dojo in 2021 and made his in-ring debut later that year against Ryohei Oiwa. After graduating from the Young Lions system in 2023, he joined Zack Sabre Jr.’s TMDK stable. Fujita and Robbie Eagles, known as the Ichiban Sweet Boys, won the 2024 Super Junior Tag League before capturing the IWGP Junior Heavyweight Tag Team Championship for the first time at Wrestle Kingdom 19 in 2025.

Outside NJPW, Fujita has competed for All Japan Pro Wrestling (AJPW), Ring of Honor (ROH), and Major League Wrestling (MLW).

Pro Wrestling Illustrated ranked Fujita No. 70 in the PWI 500 in 2025.