Bruce Wayne wakes up one morning to find that his life is completely upside-down: his parents are alive, the Batcave does not exist, Alfred does not remember Robin, and he is engaged to Selina Kyle. However, it doesn't mean that Batman isn't still around, and Bruce starts to wonder what has happened, especially after seeing the characteristics of a dream (such as book and newspaper prints not making sense) inside this new life.

A mysterious ninja is robbing Wayne Enterprises subsidiaries, and Batman discovers that the ninja is actually his equal in combat. A grudge against Bruce Wayne and skills to match him can only mean one person: Kyodai Ken, an old rival of Wayne's teacher from his days in Japan, and who was thrown out of the dojo after attempting to rob it, only to be stopped by Wayne. Ken, it turns out, wants revenge.