Yuki Nakagawa is the star of his school, admired by everyone. With a bright personality and a life sailing on smooth waters, he’s lived every day in pure happiness—until his 17th birthday. On that day, his father reveals a shocking truth: 'The truth is, you're actually an alien.' Yuki, of course, doesn't believe a word of it. But then, 'a certain ability' begins to manifest within him...!?