Thread title says all, but i'll elaborate further.
I have a strange habit where on certain manga hosting websites, i'll sit there and browse under the "mature" tag, not for porn but for something else.
Therein lies what i seek, manga that hides the darker side to humanity, what is repressed, what is unknown, and what is hidden.
One that comes to mind is the works of Nishioka Kyoudai, a brother sister manga team that makes strange, dreamlike or ethereal manga that veers off to the horrific with some containing unexpected depictions of violence, rape and gore.
Another manga that i read a while ago was Goodnight PunPun, On one hand you have a serious story about childhood trauma, but you also have an artstyle that has a strange, childish, cartoony quality.
Pic related is from a manga titled Back when you called us devils, a story about terrible actions having severe consequences, it makes you think, "can i forgive a monster" and "is it possible to move on from the past"?"
If you pay close attention you might see funny cats too.
Also as a bonus, post unexpected moments related to the title, that appear in regular manga or in unexpected places.
For me, as i was reading kenshin i was kind of shocked when it was revealed that Sagara Sōzō was beheaded and his head mounted on a pedistal, i didn't personally expect things to go THAT far, i knew the tone of the manga was dark but for some reason i feel like it was brutal.