Kedamonotachi no Jikan: Kyouisonshou Kougun

Airi Hirakawa, an active model in a popular women's magazine, suddenly faints in front of her house and get abducted by a man. She wakes up in a room surrounded by garbage and get proposed by Hirokazu Imai, a man who seems to be her stalker and her kidnapper. She will then suffer from sexual violence every single day and won't get to eat or go to the toilets by herself. Why is this happening to her?