Nishikifuji Ryūsei , born 22 July 1996 as Ryūsei Ogasawara is a Japanese professional sumo wrestler from Towada. He wrestles for the Isegahama stable and made his debut in September 2016 and reached the top division in July 2022. His highest rank has been maegashira 3. With the exception of the sandanme division, Nishikifuji has won championships in each of the four lower divisions of professional sumo, as well as a jūryō championship. He also earned a special prize in his makuuchi debut in July 2022.

Isegahama stable , formerly known as Ajigawa stable from 1979 to 2007, is a stable of sumo wrestlers, part of the Isegahama ichimon or group of stables. Its current head coach is former yokozuna Asahifuji.