Luka and Lumi Kobayakawa are twin sisters in love with the same man, athletic upperclassman Katsuyuki Touma. Lumi seems supportive of Luka's fledgling romance with Katsuyuki, until the twins are infected with a strange bacterium that transforms Lumi's personality and gifts the twins with terrifying psychic powers. Now Lumi will stop at nothing - or no-one - that gets between her and Katsuyuki, including her own twin sister...

Luka en Lumi Kobayakawa zijn tweelingzussen die verliefd zijn op dezelfde man, de atletische upperclassman Katsuyuki Touma. Lumi lijkt Luka's prille romance met Katsuyuki te steunen, totdat de tweeling besmet raakt met een vreemde bacterie die Lumi's persoonlijkheid transformeert en de tweeling angstaanjagende paranormale krachten schenkt. Nu stopt Lumi voor niets (of niemand) dat tussen haar en Katsuyuki komt, inclusief haar eigen tweelingzus...

　　小早川流风和流水本来是一对感情很好的双胞胎，而且她们都爱上了田径队的当麻克之学长，可是克之却选择了妹妹流风.

　　在一次田径队举行的外出旅行中,流风一行人为了避雨而进入了一个山洞, 但是,山洞是一座古墓! 大家闻了其中的气体便一一倒下了。当流风苏醒时却发现只有自己和姐姐流水活了下来, 而且流水的行为变得异常诡异! 原来她们都中了古墓中的病毒，拥有了能自由漂浮和穿越物体的超能力，且能力在月圆时最强。流水与流风感染了两种截然相反的病毒，感染了流水病毒的人会丧失意志成为流水的傀儡，而流风的血可以让他们恢复正常。病毒让流水性情大变，出于嫉妒她坦言流风要让出克之之类的话, 并一次一次的迫害流风。由于流风也有同样的能力, 在紧要关头都能化险为夷。

　　得知真相的克之打算帮助姐妹俩恢复正常, 丧心病狂的流水却将克之的父母兄弟无情的杀害。流风约流水进行决斗,克之赶来,为化解姐妹俩的仇恨,克之甘愿被流水杀死,在最后关头,流水依旧无法下手,而独自离开...

Ruka e Rumi Kobayakawa são irmãs gêmeas apaixonadas pelo mesmo homem, o atlético veterano Katsuyuki Touma. Rumi parece apoiar o romance incipiente de Ruka com Katsuyuki, até que as gêmeas são infectadas com uma estranha bactéria que transforma a personalidade de Rumi e dá elas terríveis poderes psíquicos. Agora Rumi não vai parar por nada - ou ninguém, que ficar entre ela e Katsuyuki, incluindo sua própria irmã gêmea...