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Ryuji Niwa
Black Belt
Ryuji Niwa is the head instructor at Carpe Diem Hiratsuka, a Brazilian Jiu-Jitsu academy in Hiratsuka, Japan. This profile was built from the IBJJF academy directory, where Ryuji Niwa is registered as the academy's responsible instructor. Instructors can claim this profile to add a full bio and photo.
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