The main characters in this article come from "Natsume's Book of Friends", with additional additions. It revolves around the unholy love and the erratic relationship between brother and sister. The final ending is not sad, but the process is a bit tangled. Hope you all will like it. The protagonist is the same as in "The Most Lover", he really doesn't want to insert another girl between Natsume and Yuba.
Conception: