Most people will occasionally have a desire to repeat parts of their lives. For some, it may be to talk to someone who has passed on or to relive experiences that are no longer possible for them. It's a normal feeling, and anime has explored this concept in numerous ways over the years. Time loops, age reversals and Isekai tap into desires that can not be satisfied through life. The past will always remain the past, but the laws of reality do not apply to anime.
Source：https://www.cbr.com/isekai-anime-second-chances/
