Ruka's elder twin sister, Rumi, is more of a tomboy compared to Ruka, though their differences are subtle. Both Rumi and Ruka were in love with Katsuyuki, but he fell for Ruka instead. This fueled Rumi's envy and hatred towards her sister, which intensified due to a virus that transformed her into an evil entity. Upon gaining supernatural powers similar to Ruka's, Rumi acquired the ability to control others by transmitting a virus through her saliva and blood. Driven by her desire to win Katsuyuki's affection, she committed numerous murders. However, each act of violence caused her immense pain, leaving her unable to sleep without the aid of drugs. Ultimately, Rumi longed for Ruka to end her life. The author notes that if Katsuyuki had fallen in love with Rumi instead, the twins' names in the story would simply be swapped.
kobayakawa rumi
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Kobayakawa Ruka
Main
Rumi's twin younger sister. Ruka is shyer than Rumi. however, sometimes, she becomes emotional like Rumi. Ruka was infected with a virus at an old burial mound, and she gets supernatural powers (flying in the sky and power pass-through), and an antibody t...
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Kobayakawa Rumi
Main
Ruka's twin older sister. Rumi is more tomboyish than Ruka, but they make a little difference such. Rumi and Ruka loved Katsuyuki but Katsuyuki fall in love with Ruka. Since her envy and hatred for Ruka have been increased by virus, she turn into evil. Wh...
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Touma Katsuyuki
Main
A high school student. Katsuyuki is famous sprinter. He is a good looking guy and popular with the girls. He fall in love with Ruka. Only he can distinguish Rumi from Ruka. Katsuyuki meets with the case that Rumi causes. He supports her in a side of Ruka ...