Iriya no Sora, UFO no Natsu

On the night of the last day of summer vacation, Naoyuki Asaba sneaks into the school pool and encounters an incredible girl named Kana Iriya, who has a silver sphere embedded in her wrist. The new semester begins, and Iriya transfers into Asaba's class. Iriya seems unaccustomed to interacting with others, but she opens up only in front of Asaba. Their relationship grows closer during school life. However, due to frequent mentions over the school intercom, strange "reactions" sometimes occur... At such times, a man dressed in black always appears?? Makibara promptly helps Iriya escape these awkward situations. Does Iriya bear some inescapable fate and a heavy mission...!? Soon, the truth gradually comes to light regarding the fortress city of military bases, "Sonohara," and the cause of the UFO disturbances that the news club has been trying to uncover, through facts about the existence of the special fighter jet "Black Shield," its pilot, and the escort units... The troubled "Summer of UFOs" for Iriya and Asaba is just beginning...