Again!!

Again!! (アゲイン !!) is a Japanese manga series written and illustrated by Mitsurō Kubo. It started serialization in 2011 in Weekly Shōnen Magazine published by Kodansha and is still ongoing. It will be adapted into a Japanese television drama series in the summer of 2014.

Plot
Graduating high school senior Imamura Kinichirou is a loner, without friends or social activities. But his isolation is at least in part his own doing, as Imamura has never been friendly himself. When an accidental fall on the day of his high school graduation seems to start him over again on the first day of school three years before, Imamura seizes the chance to do things better, but he doesn't know if it's really happening or he's only dreaming.