Second Chance anime

Characters in these anime are sent back in time, against their will, into a younger version of themselves to have a second chance at life. Typically this occurs after the characters die or are killed, but sometimes through other means. After they appear in the past, they may use the opportunity to atone for their past mistakes, to save a life, or to simply live a different version of the life they once had. If the characters travel into the past more than once, Time Loop is used instead.