This book involves rebirth, time travel, and reincarnation, which may be a bit confusing, but it varies from person to person (Note: Rebirth means that A+ is reborn back to his previous body, so there is only one A+ in rebirth; time travel means that A+ travels somewhere, so there are two A+ in time travel; reincarnation... No need to explain it?)
Purpose: Beating one person by ten people is called bullying, but it is also called bullying by one hundred people, but it is also called justice by ten thousand people.