Kou Yamori is a middle school student who struggles with grasping the complex concept of love. Plagued with insomnia due to his idleness, Kou begins roaming the lonesome streets at night.

One night, Kou encounters a bizarre girl named Nazuna Nanakusa who believes that people stay awake during the night because they are dissatisfied with how they spent their day and cannot rest until they release their inhibitions. Nazuna offers to help Kou with his sleep issues and invites him over to her place, where she convinces him to share a futon with her. Feeling uncomfortable, Kou only pretends to doze off—which is when Nazuna suddenly bites his neck, revealing herself to be a vampire!

While Kou thinks the bite will turn him into a vampire, the specifics of transforming are not that simple. In order to change, he must be bitten by someone he truly loves. Ready to let go of his dreary mortal life, Kou decides on a new goal: he will fall in love with Nazuna and become a vampire himself.

In the world of guns and steel that is Gun Gale Online, LLENN has been a devoted, female solo player. She is obsessed with two things: donning herself entirely in pink and honing her skills with consistent game play. She soon discovers her love for hunting other players (a.k.a. PK), soon to be known as the “Pink Devil.” Meanwhile, LLENN meets a beautiful yet mysterious player, Pitohui, and the two click right away. Doing as she is told by Pitohui, she enters the Squad Jam group battle.

“韦驮天” × “魔族” × “人类”，世人无从知晓的禁断大逃杀现在开始——
经过一番壮烈的战斗，以压倒性的速度与强大而自豪的战斗诸神“韦驮天”封印了导致世界毁灭的“魔族”，自那以后过了800年。如今，“那场战斗”不过是遥远神话当中的传说故事而已。从出生起一次都没有战斗过的“平稳世代的韦驮天们”享受着安逸的生活，此时不知何人让魔族从漫长的沉睡当中再度复活了——武力、智略、政治、阴谋，总之只要是能用上的东西不论什么都拿出来吧！无规则＆无限制的三方大逃杀现在开始！！