The games follow the story of Kyō, a blue-haired 10-year-old boy who travels the Denjū world looking for his missing father, as he journeys on his quest to become a T-Fanger. His friend Midori travels with him on the journey. During his adventure, he encounters Diablos, a Denjū which is not happy about humans entering the Denjū world, killing off the "antenna trees" required to link the Denjū and human worlds. Source: Wikipedia, "Keitai Denjū Telefang," available under the CC-BY-SA License.