The Manga

The beginning
Reigi Ozora, Slacked off, failing student and a complete loser! Who expect him to be a hero. He's never got a ounce of confidence that h'ill ever get use to a game. When his faithfull childhood friend, Maiko Yukino led him to the D-center, his whole life changed forever....

Book 1
Reiji was late to school, Again! A nasty suprise was there when he finally got to school. 31% on his test, and even worse, Maiko got her hands on it before Reiji did! To stop her from showing everybody else, Reiji agreed to "hang out" with her after school.