In general, Junji Ito's manga don't have many overlaps. They often explore different themes and horror elements, providing diverse and distinct reading experiences.
One of the best is 'Uzumaki'. It's a terrifying tale centered around a town obsessed with spirals. The way Ito uses the simple concept of spirals to create an all - pervading sense of dread is masterful. Another great one is 'Tomie'. Tomie is a character who can't die and her presence brings out the worst in people, leading to some truly disturbing situations. And 'Gyo' is also notable, with its grotesque concept of fish walking on land, it makes for a very unnerving read.
For me, 'Tomie' stands out as extremely scary. The idea of an immortal and malevolent woman causing chaos and horror is terrifying. The detailed illustrations add to the creepy atmosphere.
Junji Ito's stories don't have a strict connection. They're more like individual expressions of horror and strangeness. However, you might notice some common themes or visual styles that give them a certain cohesion.
Well, 'Tomie' is often considered a top choice. The way the character is portrayed and the mysterious plotlines make it stand out. Also, the art style adds to the overall creepy atmosphere.
I'm not a web novelist and I don't have any information about Ito Junji. However, if you have any questions regarding other novels, I would be happy to help you.