Black Hair Mask was Sun Halo Mask's partner for a plot to distribute the drug Z20 throughout Japan's water supply, drying up the rivers and making it as dry and barren as the driest deserts in Africa. Peggy and Kenji try to catch on but Black Hair Mask is used as a diversion while Sun Halo Mask tests the drug on a reservoir drying up all the water within. Upon further investigation by Yoko (007), the trio discover the duo making a base of the abandoned Oyama Amusement Park, which they investigate and become trapped within, ultimately sealed within a ferris wheel car before breaking open the windows and using their Birdies to fly themselves and Yoko to an awaiting Variblune.