in Dradition became more sporadic, and he instead became a regular in All Japan Pro Wrestling (AJPW) once again, forming the Dark Kingdom stable with Kenso, which would later add Black Tiger VII, Black Tiger and Takeshi Minamino to its ranks. As Dark Kingdom, Nagai and Minamino won the All Asia Tag Team Championship in January 2015. They dropped the titles to Ultimo Dragon and Yoshinobu Kanemaru in March. Nagai would later debut and make Pro Wrestling Noah his home in late 2017, entering the 2017 Global League where a loss to Naomichi Marufuji stopped him from reaching the final. Fighting style As a fighter, Nagai utilized his shootboxing background and made use of precise kicks, knees and body punches before engaging in clinch fighting. Owing to his shoot wrestling influence, he showed excellent knowledge of leglocks and often used single and double-leg takedown attempts to transition into leglock battles, notably winning several fights by heel hook. As he wasn't the strongest fighter in RINGS, he operated an efficient bottom grappling game centered around his flexibility and ability to transition to submission attempts from unlikely positions. Championships and accomplishments All Japan Pro Wrestling All Asia Tag Team Championship (3 times) - with Masahito Kakihara (1), Masayuki Naruse (1), and Takeshi Minamino (1) Giant Baba Memorial Cup (2002) Chō Sentō Puroresu FMW FMW World Street Fight 8-Man Tag Team Championship (1 time, current) – with Black Tiger V, Black Tiger VII and Tiger Mask III Tigre en Mascarado Muga World Pro Wrestling Muga Premium Tournament (2006) Real Japan Pro Wrestling Legend Championship (2 times) Mixed martial arts record |- | Win | align=center| 18-8 | Takaku Fuke | Submission (ankle lock) | U-Spirits - Again | | align=center| 1 | align=center| 8:46 | Tokyo, Japan |- | Loss | align=center| 17-8 | Akira Maeda | N/A | Rings - Mega Battle Tournament 1997 Final | | align=center| N/A | align=center| N/A | Tokyo, Japan | |- | Win | align=center| 17-7 | Chris Haseman | Submission (heel hook) | Rings - Mega Battle Tournament 1997 Semifinal 1 | | align=center| 1 | align=center| 9:18 | Tokyo, Japan | |- | Win |align=center| 16–7 | Mikhail Simov | Submission (kneebar) | Rings - Rings Fighting Extension 6 | |align=center| 1 |align=center| 6:38 | Kagoshima, Japan | |- | Loss | align=center| 15-7 | Yoshihisa Yamamoto | Submission (armbar) | Rings - Fighting