S1, E1: Tsusui Yukitaka is entering Kisaragi High School in Yamagata on a baseball scholarship. He arrives, eager to start out his new life living on his own. However, a young man who claims to be an amnesiac alien has arrived at his apartment. Yukitaka doesn't believe a word the man says. But, as strange things happen one after another, he begins to realize that he is not a man of this world. From deep down inside him, he begins to think "Could he actually be...?" A man wrapped in mystery who calls himself an alien but has lost his memories. What is his true identity? What is his purpose? This is the beginning of a slightly off-color sci-fi story.