When Keyaru gained his abilities as a Hero who specialized in treating all injuries regardless of severity, it appeared like he would have a bright future. But instead, he was tortured to years of apparently unending horrible pain and abuse. Keyaru's healing talents allowed him to surreptitiously acquire the memories and abilities of everyone he healed, progressively strengthening him to the point where he was stronger than anyone else. But it was much too late by the time he realized his full potential—he had already lost everything. Keyaru, determined to get his life back on track, cast a strong healing magic that rewound the entire planet back to before he began to suffer his terrible fate.