A sudden rainstorm hit while Urara Kanon was on her way home from school, and she was completely soaked. She could only seek refuge at her future brother-in-law's house, a man who was about to get married to her sister. Seeing his future sister-in-law in a tight dress soaked by the rain revealed her very alluring bra. Looking at his sweet sister-in-law like that made him unable to control his primal instincts and he embraced Urara and then...