Following a near-death experience, an otherwise ordinary young man named Noah finds out that he has become immortal. Deciding to make good use of his abilities, he becomes a bodyguard, but an unexpected side effect of his powers forces him to quit the job.

It's then that he meets a shady-looking man named Allen Walker, who offers to take care of that particular side effect in return for his resuming bodyguard work...

Follows two boys with disabilities, Onishi Yuu and Ishida Kenji, as they deal with the trials and tribulations of high school life.