但因为药剂有副作用,也因此造成20亿人的发病,间而诞生「嗜血种」这样的新生命体。之后,“嗜血种”与人类之间的战争爆发, 虽然最后以人类方的胜利收场,但是残留下来的嗜血种却还是存在于这个世界上….。最终,人类凭着人造血液及被称为“D-GPS”的嗜血种管理系统,来保障嗜血种的生存权利。 这个故事,是在人类与嗜血种共存为日常生活的舞台上进行的。
Tanaka Tetsuro is excited at getting a full scholarship at a new high school, far away from his family. What he does not know is that he will be the only boy in an all girl school, and that there is a girl head-over-heels in love with him, waiting for his arrival. But his special friendship with the very cute and dynamic Asuka also causes him to get into a lot of trouble with the powerful student council leadership, as they are at open war with Asuka and her five friends, a group of super amazon warriors called the Koi Koi Seven.