[DeepL Translation - needs review] Volume 1 Introduction: One night, Iwai, a senior in high school, is walking with Watanabe, a girl in his class with whom he has been having a physical relationship, when they are suddenly attacked by a monster who calls himself "Yoru-sha. Watanabe is sucked by the monster and killed, and he himself is almost killed, but he recovers instantly when he drinks the "Yoru-sha's" blood. He also gains inhuman physical abilities. The "Night Man" declares that he wil...
