My elder sister fell in love with me and transformed into a yandere

Nozomu, a third year in middle school, has an elder sister 2 years older than him, Hitomi. One day, When he went home from school, his elder sister started being violated by his father-in-law. He saved her although it was dangerous, after that, the attitude of Nozomu\'s elder sister completely changed. Obsessed by her younger brother as opposite sex, she started to remove women who approaches her younger brother one after another. As he try to regain the everyday happiness of his deceased father, Elder sister\'s abnormal affection escalates