Yuichiro Nagashima

He lost to Yoshihiro Sato by unanimous decision at Hoost Cup: Kings in Nagoya, Japan on June 16, 2013.

Nagashima stopped a three-fight skid when he beat Hiroki Shishido by unanimous decision at Shoot Boxing Battle Summit Ground Zero Tokyo 2013 in Tokyo, Japan on November 15, 2013.

In 2013, Nagashima made a return to pro wrestling in IGF, beating Black Tiger in two consecutive matches.

He faced Henri van Opstal at REBELS 13 in Tokyo on October 28, 2012 with a place at the Shoot Boxing World Tournament 2012 on the line. He lost via unanimous decision (30-29, 30-29, 29-28).

He lost a one-sided unanimous decision to Robin van Roosmalen at Glory 4: Tokyo - 2012 Heavyweight Grand Slam in Saitama, Japan on December 31, 2012 after being dropped in round one.

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 & Otani. Two months after, Nagashima teamed up with Hashimoto and Otani to defeat Ryoji Sai, KAMIKAZE & Munenori Sawa.

On March 27, 2010, Nagashima participated to K-1 World Max 2010 Japan tournament. He won the tournament with 3 consecutive knock outs. Although he wanted to defend his NJKF title after this tournament, he returned his title as on 1 April because he was going to participate the world tournament and it was hard to arrange his schedule for defending title.

On December 31, 2010, Nagashima took part in a "mixed rules" bout against judo and Brazilian jiu-jitsu expert Shinya Aoki at Dynamite!! 2010, the annual New Year's Eve fight festival. One round was to be held under kickboxing rules and the other under mixed martial arts rules. A coin toss decided that the kickboxing round was to commense first. Aoki took advantage of the fact that he only had to survive through a single three-minute round of kickboxing and thus threw pointless attacks like flying dropkicks and rolling heel kicks while holding onto the ring ropes in order to run the clock down. As the second round began, and Aoki now in his element under MMA rules, he dropped immediately for a double leg takedown, while Nagashima launched a flying knee square into Aoki's jaw. The blow instantly knocked out Aoki, after which Nagashima followed up with a number of hammerfists on the supine Aoki. The referee stepped in and stopped the fight four seconds into the period.

On January 25, 2009, he was chosen and awarded 2008 Outstanding Performance Award by NJKF, and also given 3 more awards certified combat sports medias.

After winning the title, Nagashima was offered by K-1. He participated K-1 World MAX 2009 Japan Tournament on February 23, 2009, and he knocked out Hayato at 2R at the quarterfinal, but he was beaten by Yuya Yamamoto and lost by TKO because of being cut at the semifinal.

After the Japanese tournament, Nagashima was offered to fight against Albert Kraus from Netherlands on April 21. They engaged in a heated war of words before the bout where Kraus said "he seems to be a gay". The fight ended in Nagashima losing by knockout in round one. On October 26, Nagashima was offered to fight against Xu Yan from China. Although he trained at Masato's gym, he was knocked out at round one. In December, he was awarded the 2009 Walkout of the Year by Inside MMA of HDNet.

Since 2007, Nagashima shifted his workplace to kickboxing, and he became known as "Otaku kickboxer" because of his entrance show before the bouts. He won ten consecutive victories, and won the vacant title of NJKF at Super welterweight on December 9, 2008. This was the first time for NJKF that the kickboxer who is not the member of NJKF wins the title of NJKF (Sakigake juku is not member of NJKF).

Yuichiro "Jienotsu" Nagashima (長島☆自演乙☆雄一郎 , Nagashima Jien'otsu Yūichirō, born July 2, 1984) is a Japanese welterweight kickboxer, and a cosplayer, fighting out of Nishinomiya, Hyogo, currently competing at K-1. His rank is 2nd dan black belt in Nippon Kempo.

Yuichiro Nagashima was born in 1984 in the city of Nishinomiya, Hyogo. He started learning judo when he was an elementary school. He continued training Judo until the graduation of junior high school. He decided to be a professional fighter when he was at the 3rd year of junior high school because he watched Andy Hug on television. Moreover, Nagashima swore to entertain the audience. During his high school life, he practiced full contact karate, but he attended training only once or twice a week.