A guy, who lost their memories only remembers spending their whole life full of guilt for not forgiving their friend, wakes up in front of a white-haired woman. She tells him that she is his only remaining believer and that he is the 'God of Forgiveness'.

The believer tells him that the world has come to an end and that he has to go back in time to forgive the other Gods and unite them as one, and if he succeeds, all of his memories will return.

After he agrees, she sends him back in time to go on a long journey to forgive the other Gods, learn how to forgive, and relearn who he is to himself.