Responses
So far this what I have read and similar; Madk, killinng stalking, the summer Hikaru died, the ware house, Murderer Llewellyn's Enchanting Dinner Invitation
But still not enough QAQ
omg I love that manga as well, here’s a list with similar works https://www.mangago.me/home/mangalist/3934504/
I really love this manga, it's called double suicide https://www.mangago.me/read-manga/double_suicide/
So, I try to find similar ones. The semi–incest part is not necessary, as long as it has gore, suicidal, cannibalism (maybe), phycological, horror, Shounen ai or yaoi... That kind of vibes