Ane o Tasukeru Tame Nokosareta Shimai o Kegasu Haitoku no Hibi

姉を助けるため残された姉妹を穢す背徳の日々
Ogura Shinichi lost his mother as a child and gained a new family through his father's remarriage to a stepmother and her three daughters. Despite his father and stepmother being frequently absent due to work, they live a peaceful life together. However, their tranquility is shattered when the oldest daughter, Kasumi, is kidnapped. The kidnapper demands that Shinichi violate one of his younger sisters in exchange for Kasumi's safety. Initially doubtful, Shinichi is shown a distressing video of Kasumi that takes a toll on his mental state. Succumbing to the kidnapper's influence, he violates his second sister, Satomi, and even third sister, Yuu. Sadly, Kasumi remains captive, and the situation worsens as Shinichi's childhood friend, Makoto, and his teacher, Naoko, become involved. Isolated from their parents and the authorities, Shinichi and his sisters experience a gradual erosion of their sanity. How long will this abnormal and never-ending nightmare continue?
Ogura Kasumi
Ogura Kasumi
小倉 佳澄
primary
Ogura Satomi
Ogura Satomi
小倉 里未
primary
Ogura Yuu
Ogura Yuu
小倉 優
primary
Sakurai Makoto
Sakurai Makoto
桜井 真琴
primary
Houjou Naoko
Houjou Naoko
北条 奈桜子
primary
Ogura Shin'ichi
小倉 信一
main

Original edition

staff
Kadomatsu Kazuya Scenario supervision