DDHH-006 I was imprisoned by that person, Nagisa Mitsuki.

Mitsuki, a beautiful girl who had fallen in love with a man she encountered on her way to school. One day, while returning home, she was suddenly attacked. She was taken to a ruin and gang-raped by two unknown men, and even had her ordeal recorded on video. Restrained, she was violated with toys, forced into fellatio, and ultimately had her virgin vaginal slit penetrated in a threesome. Why? How could this happen? The senseless imprisonment and abuse caused Mitsuki's mind and body to collapse. Who were the men who committed these acts…?