Kohei Sato
On March 6, 2011, Nagashima appeared in the puroresu promotion Pro Wrestling ZERO1 to challenge fellow rookie Daichi Hashimoto, who was scheduled to face Masahiro Chono, and said that he had also made his debut in wrestling and soon would be Daichi's rival. Nagashima began training in the ZERO1 dojo under Shinjiro Otani, who was also Hashimoto's trainer. Although Daichi was the original target to Yuichiro, veteran wrestler Kohei Sato offered to wrestle Nagashima first, so Yuichiro had his debut on May 5 at the Korakuen Hall against him, with th Otaku Kickboxer winning the bout. The match was highly praised and some said that Yuichiro's skill was such that he seemed to have years of experience. Later, on June 14, Yuichiro had his first match against Daichi, teaming with former yokozuna and K-1 fighter Akebono to defeat Hashimoto &amp; Otani. Two months after, Nagashima teamed up with Hashimoto and Otani to defeat Ryoji Sai, KAMIKAZE &amp; Munenori Sawa.