Daiki Nagai is a Japanese professional wrestler currently signed to New Japan Pro-Wrestling (NJPW), where he competes as a member of Unbound Co. After competing in hammer throw and jiu-jitsu during high school and serving two years in the Japan Ground Self-Defense Force, he joined the NJPW Dojo on his second attempt in 2023 and made his professional debut as a Young Lion in June 2024. As is customary for Young Lions, Nagai spent his first months gaining experience against more established wrestlers before earning his first victory alongside Katsuya Murashima in October 2024. In 2025, he accepted an invitation to join Unaffiliated, competed in the Super Jr. Tag League alongside Clark Connors of the War Dogs, and became part of Unbound Co. when Unaffiliated and the War Dogs merged at New Year Dash!! in 2026.