Waffle - Rinjin ni Kowasareteiku Ore no Tsuma

While going on a business trip, Kazuki receives a mysterious link. When he click on it out of curiosity, he sees a video of a woman who looks like his wife being violated. After returning from the trip and carefully questioning his wife, he is relieved to see that everything seems normal.
One day, a man named Kanamori Yuuji moves to the vacant room next door. Despite his scary appearance, he is quite polite. Thus, Kazuki's anxiety quickly vanishes. And because of that, he doesn't notice his wife's gradually change since Yuuji came.