It’s a domestic/incest-themed plot — a common trope in adult doujinshi. While not deep, it has more setup than typical "throwaway" works. The power dynamics and psychological tension are handled better than average, but don’t expect a literary masterpiece.
The light novel serves as the original source material for the doujinshi, with both mediums sharing the same core scenarios and plot. However, a key difference is the ending. The doujinshi concludes on a highly ambiguous note, leaving the final fate of the characters open to feverish fan debate and imagination. In contrast, the light novel moves past the ambiguity and provides a definitive, albeit bleak, conclusion to the story, offering some closure for readers who were tormented by the open-ended finale of the original comic . The popularity of these works even led to a subsequent novel series, Taneshige-ke no Katei Jijou , which started in 2017 . It’s a domestic/incest-themed plot — a common trope