When high school student Souji Kushiki, an academic achiever and talented athlete from a well-to-do family, returns home from summer vacation, he finds that his sisters Harumi, Youko and Saki have changed. Their strangely clingy behavior borders on the inappropriate and bizarre, yet Souji just brushes off their mysterious conduct at first.However, when Souji arrives at school the next day, he learns that, during the summer, three students were murdered by an unknown culprit. Are the victims linked, and could Souji’s sisters have anything to do with the murders?With the help of his cheery and spunky new girlfriend Yukako Sasai, straight-laced Souji is about to venture into a mysterious world that might just be the death of him.
“Your little sister is a MURDERER. Just like YOU.”With the police no closer to finding the killer responsible for the murders of three high school students, Souji Kushiki and his plucky girlfriend Yukako continue down their own path of investigation. While Yukako seems to hit a dead end in her detective work, Souji has his own disturbing suspicions. He’s narrowed down the list of suspects to just a handful of people: his family!Could one of his clingy, possessive younger sisters really be the killer? Or could the dark truth go deeper than even Souji imagined? Whatever the answer, someone else will soon die and Souji’s world will be rocked to the core!