The Reinhyl Public Health Institute (RPHI) is the public health agency of the Kingdom of Reinhyl. Its goal is to promote health and safety and prevent the spread of contagious diseases through education, research, and guidelines.
Due to its guidance, travel to the mysterious island has been prohibited to prevent the spread of the island flu. Although a vaccine exists, the flu keeps changing. The RPHI recommends taking the flu vaccine once per year.