New Japan Pro-Wrestling (2021–present) Young Lion and foreign excursion (2021–2025) Nakashima made his debut for NJPW on February 14, 2021, during the Road to Castle Attack event, facing
Yuya Uemura. However, the match was stopped after Nakashima dislocated his elbow. Following his recovery, Nakashima participated in NJPW's Young Lion matches, frequently competing against wrestlers like
Ryohei Oiwa and
Kosei Fujita. He achieved his first victory on April 20, 2022, defeating Oiwa. In 2023, Nakashima formed a tag team with
Oskar Leube, known as "Young Blood". In January 2024 at
New Year Dash!!, Young Blood wrestled their final match as
young lions before embarking on learning excursion (as is customary for NJPW Young Lions), losing to
El Phantasmo and
Hikuleo.
Knock Out Brothers (2025–present) On the final night of
G1 Climax 35 on August 17, 2025,
Bullet Club War Dogs leader
David Finlay introduced Nakashima (now known as
Yuto-Ice) and Leube (now known as
Oskar) as the newest members of Bullet Club War Dogs as they attacked
Satoshi Kojima,
Taichi and Katsuya Murashima. Yuto and Oskar also changed their tag team name to "Knock Out Brothers". At
Destruction in Kobe, Yuto and Oskar defeated Taichi and
Tomohiro Ishii to win the
IWGP Tag Team Championship, marking their first championship in NJPW. After Wrestle Kingdom 20, at
New Year Dash!!,
David Finlay and
Yota Tsuji announced the dissolution of
Bullet Club and Mushozoku, replacing the alliance with
Unbound Co., which was a complete merger, also in the Main Event of the show they defeated
Ryohei Oiwa and
Zack Sabre Jr..
European independent circuit (2024–2025) In early 2024, Nakashima embarked on an excursion to Europe, wrestling for the likes of
Revolution Pro Wrestling (RevPro) and
Westside Xtreme Wrestling (wXw). At RevPro’s High Stakes 2024 event, Young Blood defeated Kieron Lacey and Mark Trew in a tag team match. Young Blood also participated in a tag team match to defeat David Francisco and Goldenboy Santos in a street fight at a subsequent RevPro event. In wXw, Young Blood won the
wXw World Tag Team Championship at the
World Tag Team Festival in October 2024, defeating KXS (
Axel Tischer and Fast Time Moodo) in the finals. In March 2025, they lost the titles to Big Bucks (Alex Duke and
Norman Harras), ending their reign at 152 days. == Personal life ==