My Sister Sleeps With My Dad

Naoto has always looked up to his older sister, Yuna. As the student council president, she is admired for her eloquence, dignified presence, striking beauty, and sharp intellect. To Naoto, she represents everything a sibling could be proud of. However, his admiration is tested when he begins noticing an unsettling shift in her behavior at home. Recently, Yuna has been engaging in excessive physical affection with their stepfather, crossing boundaries that leave Naoto deeply conflicted. Their closeness escalates to the point where they even share baths together, blurring the lines of their family dynamic entirely. When confronted about this inappropriate relationship, Yuna does not shy away or offer excuses. Instead, she addresses her younger brother's turmoil directly, boldly declaring that she will show him the intimate reality between herself and their father. Originally released as a three-part doujinshi series, the story was later compiled and published by GOT into a single volume featuring newly written chapters, including a prequel and an after-story.