Shion Kojima prefers to fade into the background, avoiding attention at all costs. Unfortunately for him, his classmates seem determined to pull him into their world, especially Michiko Takahashi, the smartest girl in class, whose presence alone disrupts his carefully maintained distance. One da...

Past (Introduction) Arc: Sako Noboru is a 16-year-old teen, whose parents were murdered when he was only 8. The year now is 2072, and he feels guilty for their deaths. All the while, his friends don't know anything about him, but they still try to cheer him up. Will they succeed in making him se...