Hana Iwaki (born April 17, 2001), better known by her ring name Cohaku (or Kohaku), is a Japanese professional wrestler currently signed to Pro Wrestling WAVE, where she is a former one-time Regina di WAVE Champion, one-time Dual Shock WAVE Champion and winner of the 2025 Catch the WAVE tournament. She first debuted for Marvelous That's Women Pro Wrestling in 2018 and has appeared across the Japanese independent scene in her career, having also become a one-time Sendai Girls World Junior Champion and one-time OZ Academy Tag Team Champion.