The brother who started living with his younger brother and sister-in-law found their married life distasteful. One day, he came up with the idea to monitor his sister-in-law and began secretly recording her daily activities. While monitoring her, he discovered that his sister-in-law Kurumi was chatting online. Hiding his identity, he conversed with Kurumi and learned that she was not satisfied with her married life. On a day when his younger brother was absent, he summoned Kurumi and told her that he knew about the things she found unsatisfying from their chat, then raped her. He understood what acts Kurumi desired. As Kurumi basked in the afterglow of pleasure, he said, 'I'll play with you again,' to which Kurumi happily nodded.
