hmm just got up to the latest chapter (91) of Shonan Junai Gumi
9/10
hmm
http://myanimelist.net/people/5547/Shintaro_Kagohis mangas... a few of his work u can read it on mangatoshokanhttp://www.mangatoshokan.com/search/author/KAGO%20Shintaro
also might help if you go on mal advanced manga search

genre ''Dementia''
it´s not really fucked up imo; just more like horror psychological...