The concept is actually not original.. Many times, there are already many concept like this: "come back to school and make a change".
But, there are FAIL parts in this anime. That's why I rated it as BAD:
The story is in fact just a high school drama with a simple conflict and simple romance.. It is for casual watching. (Compare for example: "my boss my hero" dorama, this anime is lack of things).. Every high school boys can do what Kaizaki Arata (the main character) does. So, when you said: "You can make change by come back to high school". Well, everybody (not just Kaizaki) can do that, even better.. What the MC does are action that every normal high school boys can think of..
I expect more complicated conflict that only grown-ups can solve it OR perhaps the MC has something different that nobody has it.. (Come on... he is grown up!) and this anime failed it.. I even wonder why the creator put the theme "back to school" when all the MC does is just ordinary high school student. Nothing special.
