Kou Kinosaki is a member of the "Press Society" (PS abbrev.) together with Masuya Tazawa. He debuts in episode 5, appearing as a recurring character. Being inquisitive in nature, Kou is the kind of person who wants to get to the depth of things and to use the information gained to his own benefit, which is not known as of yet.
(Source: Binan Koukou Chikyuu Bouei-bu Love! Wiki)