Living on Guicheng Isalnd, called "the most dangerous town in the universe," is no easy task. Genetic doping is common for gangs to gain ultimate power. Shizuka, a young girl, takes on the most dangerous of assassin jobs, but she's not the one doing the killing. Rather, it's her brother, Nagi, a strong assassin who took a bullet to protect his sister, leaving him in a comatose state and having to use a wheelchair. However, Shizuka has figured out the key to waking her brother up: he must be faced with murderous intent! Thus begins a violent journey of recovery, battling the most dangerous foes!
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故事发生在被称为「宇宙最危险城镇」的鬼城岛，当地黑帮普遍使用基因兴奋剂来获取终极力量。少女平良静接下了最危险的刺杀任务，但动手的并不是她，而是她的哥哥凪 —— 一名曾为保护妹妹中弹的顶尖杀手，如今陷入昏迷，只能依靠轮椅行动。然而，平良静发现了唤醒哥哥的方法：他必须直面杀意！于是妹妹平良静开始带着哥哥与强敌们进行“康复训练”