Issei Raikos is a normal High school student, and as a normal student, he studies and do things like a normal student. But... there's something in his story, something not normal about it, and he will notice it sooner or later.
The life of Keiko starts changing after he is reunited with a girl from his past and they start spending more time with each other. Changing for the better or worse is something you're going to have to find out.