Yabai! Fukushuu Yami

A mysterious fire and a bullied girl committing suicide led her brother (Ryou Tezuka) to take matters into his own hands. Kidnapping three girls -- Yukawa Ayano, Inami Misuzu, and Tsubaki Rina -- he rapes and tortures them to extract information on why they had to bully his sister? Why did she have to die? Misuzu Inami is a model that does well, Ayano Yukawa works as an actress in public entertainment, and Tsubaki Rina seemed to be his younger sister's best friend. There is also the mystery of a journal hiding a dark past...