Kurou and Al, who crushed the conspiracy of Evil God with Demonbane, are working as detectives in a reborn world. However, another shadow is looming towards them - mysterious cases caused by "Blood Monsters". At the same time, mysterious people appear in front of them. One is a girl in a red dress and another one is a boy called "Two-Sword/Two-Gun". Just who are they, and are they related to these mysterious cases?