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In 2017, Nasukawa won the Rizin Flyweight Kickboxing Tournament. The tournament was held in Saitama, Japan, and Nasukawa defeated Takeru Segawa in the final match. This victory was a major accomplishment for Nasukawa, as he was able to defeat one of the top fighters in the world. The tournament was also significant because it helped to increase the popularity of kickboxing in Japan.