Kasumi and Haruki Hisakawa, The Tickle Twins, are youthful and innocent-looking ticklers with a dark side. They employ synchronized tickling, often targeting intimate areas. They only talk to each other and don't pay attention to their victim's words. Their mission is to push victims to the edge, and their loyalty to Chaos Hunter is unwavering in the foundation. The twins thrive on maintaining their childlike facade while delivering merciless tickling, which is both their strength and challenge.