Hello DRRR
I want to post one my favorite mangaka Kaori Yuki's best works(in my opinion) the "Hakushaku Cain Seires" some times go by "Cain Saga" _it comes with many sequels(God Child)

*You may or may not heard of Kaori Yuki's new work Alice in Murder land*

If you are looking for Mystery-Horror-Drama-Psychological a small, tiny Shougo- an a ton on Tragedy....Then this is your manga.

Main Character: a Earl by the name on Cain_has a Smart butler_younger haft sister. He is charming,make every person in the room look his way(because he is rich af and they are money hungry nobles). Big importance he leave a tail of death :( its like a cures._He dose own a collection on poisons :)
_The Plot is work of art( it should be a TV series)you can tell that Kaori Yuki has taken deep research of every event-item and tall-tail that is place into this manga. The setting is in old time in England time of the Jack the ripper( if that doesn't get you interested).

!(^3^)! -If you have read the Hakushaku Cain and want to share your thoughts please do <3