Chi no Wadachi (Trail of blood) may be one of the best modern japanese horror stories, and for sure is one of the best artistic manga out there.
Story follows Seiichi Osabe, that on one day sees his overprotactive mother trying to murder his cousing. She denies that she had tried to kill him and boy falls into coma, leaving Seiichi wandering if what he saw was even true, and if it was - why would his kind mother do such a thing?
From this point on series focuses mostly on intricate reliation between son and his mother, filled with manipulation, lies, drama and.. terror. Shuuzou Oshimi focuses mostly on the faces, which in connection with detailed shadow, gives a chilling impression that each and every face panel bears emotions and weight to the story. Very often Mother is drawn in a way she resembles onryou.
I guess some may disagree on the fact that Chi no Wadachi is a horror story - there are no supernatural elements, no gore, no extreme violence, but the story being slow-paced and focused solely on characters' psychology is what makes it even more real, to the point it makes it almost uncomfortable to read.
You won't see jumpscares or disgusting panels here, most of it feels as it could actually happen in the real world. The biggest "scare" of the entire manga is definitely mother's relationship with her son. She's constantly lying and manipulating his son to the point where he is no longer able to act on his own and it negatively influences his life.
Art style of the manga is a sight to behold, filled with tiny details. Shuuzou masterfully operates with shadows, making them flood entire panels at times, making you feel the stress and danger of the situation. Other times all the panels become ridiculously bright and white, making the reader feel the comfort and peace the characters feel. Most of the panels could be framed and hung on the wall as if they were paintings.
As for the flaws, i have to admit that there are some moments (or strings of chapters) that fell a little bit too slow or meaningless. There's a middle portion of the manga, that consists mostly of main character going to school, getting back and experiencing more strange situations with his mother.

Other than that, Chi no Wadachi is near perfection. As of this moment story has 75 chapters collected into 8 volumes and i kinda hope it'll end sooner than later.
It's definitely a series that could break a man.