Wishing happiness from despair

Mitsuru and Nobuhiko are about to get married. Mizunuma, who lives in the next room in an apartment building that had been targeting light for a while, kidnaps and confines her. Mizunuma continued to violate the light while wearing a mask, and five days later she released her. A rape footage of her uploaded online is further blown by the trauma of rape, not knowing who the perpetrator is. What are the reactions of apartment residents and beloved fiances?