I think this will be very useful. I will be very effective especially to filter releases. MC is a rapist is also a good suggestions @Tony @runsing @Westeller
1. mindless slaughter as in "mc lose his mind and go on a killing spree"? 2. mc is a rapist like in adult doujinshi/novel where mc just went and around and rape as the main plot ? or mc who rapes and later mc's victim became one of mc's harem? if you would elaborate more, it'd be better.
This review explains it https://www.novelupdates.com/fdrev/?comid=97769&sid=19937 It is supposed to be a story about a healer. Not losing his mind but being a hypocrite so to speak I guess rape can be complicated especially in a fetish setting like Doujnshi I am just referring to standard fare since rape victims do not always become lovers I recall a Japanese novel I think where the protagonist raped his prisoner of war