Narrator: Of the twelve apostles who stand at the apex of the world today, Youlman is recognized as the strongest being. But at the same time, he is also the most unpredictable apostle to humans. Because no one...

Arata Kasuga is living an ordinary life with his cousin Hijiri when a mysterious happening called a "Breakdown Phenomenon" makes her vanish before his very eyes. Determined to eradicate the Breakdown Phenomenon...

Gotta flirt to save the world!! High schooler Takuma Akutsu is terrified of human contact and just wants to live a quite life. Too bad he doesn't have a choice in the matter when nine Valkyrie sisters come...