It's difficult to see Miyuki and Tatsuya as anything other than loving siblings when they look at one other now. It wasn't always like this, though. Miyuki had always felt uneasy around her older brother three years ago. Even though he was the perfect Guardian, watching after Miyuki while she went about her normal middle school routine, the rest of their family viewed him like a lowly servant. But it was the fact that he never expressed any feelings or thoughts that disturbed her the most. However, when danger strikes on a perilous voyage to Okinawa, their brother-sister relationship will be irrevocably altered...