NACR-289 Imprisoned and Brainwashed: I was trained by my brother-in-law, Yuino Takamiya

A brother-in-law who was not related by blood, but always took good care of his younger sister Yui. One day, his father is on a company trip. As soon as he saw off his father and was alone, his brother-in-law suddenly changed. His brother-in-law's refracted affection is directed at Yui. He is confined in a room and played with Yui. At first, he resisted Yui, but he was raped and brainwashed by his brother, and fell into distorted love...