Chao-yo lives with her kind husband, Koichi, and her father-in-law, Haruo. Her father-in-law, Haruo, is kind to Chao-yo and has been talking about wanting to see his grandchildren soon. However, upon learning that Chao-yo's marital life with Koichi is lackluster and she isn't satisfied, one morning after seeing Koichi off to work, Haruo assaults her… From that day forward, every time they are alone, Haruo repeatedly engages in lewd acts. As these days repeat, Chao-yo begins to awaken to pleasures she couldn't get from Koichi…
