is a Japanese professional sumo wrestler from Kà Âfu, Yamanashi Prefecture. He made his professional debut in March 2006 and first reached the top makuuchi division in January 2018. Ryà «den has won a championship in every division except makuuchi and has earned two special prizes, one for Fighting Spirit and one for Technique. His highest rank has been komusubi. He is a member of Takadagawa stable.
As a first grader at Ikeda Elementary School, he followed his two older brothers and took up the sport of judo. He continued to practice at Kai Shiritsu Ryà «à  Junior High School in the nearby town of Kai, where he won the Yamanashi prefectural judo tournament in the over-90 kilos category. Destined to join the judo club of a prestigious high school outside his native prefecture, he was however persuaded in his second year of junior high school by Sendagawa-oyakata (former sekiwake Akinoshima), a coach at Takadagawa stable who was visiting his school to scout new apprentices, to give sumo a try, telling him he would "become a man among men". He made his debut in March 2006, the same tournament as Tochinoshin and Sakaizawa. He was immediately given the shikona, or ring name, Ryà «den, with the "Ryà «" part taken from his previous school and the "den" part from the legendary wrestler Raiden. He was talked of, alongside Masunoyama, as a candidate for the first wrestler born in the Heisei era to reach the sekitori status when he produced a 5âÂÂ2 score at the rank of makushita 15 in November 2009. However his progress then stalled with two consecutive make-koshi, and he suffered a concussion after falling from the dohyà  in a match against Takanoiwa in March 2010, and had to be carried off in a wheelchair. He was then overtaken by Takayasu who did become the first Heisei-born sekitori in November 2010, along Masunoyama. Commenting on this historic failure, his master Takadagawa declared that Ryà «den had succumbed to pressure.
Ryà «den was however promoted to jà «ryà  after scoring a perfect 7âÂÂ0 record and taking the makushita championship at the September 2012 tournament. He was promoted along five others, including Kyokushà «hà Â, Akiseyama, Homarefuji and . Ryà «den became the first sekitori produced by the new Takadagawa stablemaster (Akinoshima), who had taken over the running of the stable from former à Âzeki Maenoyama, in 2009. He was also the first sekitori from Yamanashi Prefecture since Hidenohana, 24 years earlier. At the time of his promotion, his master encouraged him to wrestle in such a way as to create excitement and rally the public to a Japanese wrestler, since sumo was dominated by Mongolian wrestlers at the time.
However Ryà «den suffered a fracture of his right hip joint in his jà «ryà  debut in November and had to withdraw from the tournament. During his long injury recuperation he made two abortive attempts to return, breaking the hip twice more. This resulted in him falling all the way down to jonokuchi 17 in the rankings, journalists commenting that Ryà «den "had to go through hell". For four consecutive tournaments from January until July 2014, although still injured, he fought (and won) one match at the end of the tournament, solely to prevent falling off the banzuke completely (banzukegai). He was finally fit to return in September 2014 and won three consecutive yà «shà  to quickly return to the fourth highest makushita division. He was finally promoted back to jà «ryà  in November 2016. Only (maezumà Â) and Kotobeppu (jonokuchi 39) had returned to jà «ryà  from lower ranks than Ryà «den had.
Ryà «den was promoted to the top makuuchi division in January 2018, becoming the second top division wrestler from Takadagawa stable (after Kagayaki) to achieve this feat since the new head coach took over. At the time of his promotion, he was the first Yamanashi Prefecture native to be ranked in makuuchi since à Ânohana in March 1988, and the seventh postwar wrestler from this prefecture to achieve this promotion. He was also the second wrestler in sumo history, after Kotobeppu, to earn a promotion to makuuchi after being relegated to the jonokuchi division.
He scored ten wins in his top division debut and shared the Fighting Spirit prize with fellow newcomer Abi. Since then, he has stayed in makuuchi and has mainly shown solid performances. In September 2018, Ryà «den was the fastest maegashira-ranked wrestler to reach the positive kachi-koshi balance with a win over Shà Âhà Âzan. For this feat and his 10 wins in total, he was nominated for the Fighting Spirit Award, but was shelved because he did not reach the majority of the attending committee members votes. In May 2019, he notably defeated à Âzeki Gà Âeidà  on Day 11 and earned a tenth victory by defeating komusubi Aoiyama on the last day of the tournament. For this performance, he received his first special prize for Technique. The following tournament, he was promoted to komusubi, a first for a wrestler from Yamanashi Prefecture since Fujizakura, 47 years earlier. His promotion to the san'yaku ranks makes Ryà «den the first wrestler in sumo history to earn a promotion to this status after being relegated to jonokuchi. With 79 tournaments elapsed since entering professional sumo, Ryà «den is also the 10th slowest wrestler to reach the san'yaku ranks. Entering the July 2019 tournament at his highest rank, Ryà «den recorded an initial defeat to yokozuna Kakuryà «, but bounced back to claim back-to-back victories over à Âzeki Takayasu and Tochinoshin. However, he finished the tournament with a poor 4âÂÂ11 record and was demoted after only one tournament in san'yaku, remaining in the mid-maegashira ranks until May 2021, where he fell to maegashira 14.
Ryà «den was withdrawn from the May 2021 tournament by his stablemaster, after the latter was tipped off by Ryà «den's wife about a cheating affair. Takadagawa accused Ryà «den of having breached COVID-19 compliance guidelines. After an investigation by the compliance department of the Sumo Association, it was found that on 25 different occasions between 12 March 2020, and 20 January 2021, Ryà «den had gone out with several women, breaking the rules on unnecessary trips. Ryà «den was therefore suspended for three tournaments retroactive to the May basho; he was eligible to compete again in November.
When Ryà «den competed again after his suspension in November 2021, he entered the competition at the rank of makushita 47. He commented that since the Sumo Association had let him continue to fight, he now had no choice but to fight without shame, while staying away from the press for a while. Ryà «den won the makushita division title with a perfect 7âÂÂ0 record. Thanks to his championship victory, he was promoted to makushita 5 and during this period he was competing to win a second tournament in a row but was beaten on the final day by Gà Ânoyama (then called Nishikawa). He however earned a promotion to the jà «ryà  division for the March 2022 tournament, where he won his first championship in that division. After the May tournament of the same year, where he scored a 9âÂÂ6 record, he won the jà «ryà  division again in July, leading to his promotion back to the makuuchi division. On his return to sumo's top division, he finished just a few victories behind the tournament winner (junyà «shà Â), maegashira Tamawashi, notably achieving a seven-match winning streak. Ryà «den was subsequently promoted to maegashira 6.
Ryà «den is a yotsu sumo specialist who prefers grappling techniques. His favourite winning kimarite is yori-kiri, with a moro-zashi hold, or both arms inside his opponent's.
In February 2019, Ryà «den announced his engagement to his partner, a nurse named Mai Fukumaru, after a four-year relationship. The couple married in June of the same year, with 430 guests in attendance. In May 2021, it was revealed by the Shà «kan Shinchà Â, alongside the investigation into the breached COVID-19 compliance guidelines, that Ryà «den was having an affair with one of his fans. It was also revealed that as a result of this relationship, the woman in question became pregnant and had, at Ryà «den's insistence, an abortion; Ryà «den had tried to pay her approximately 5 million yen in compensation, in vain.