If you're looking for manga similar to Manhole, you might like these titles. All recommendations are made by Anime-Planet users like you!
In the seemingly-normal small Japanese town of Kurozu-cho, odd events are beginning to take place. Residents are becoming obsessed with spiral - whirlwinds, snail shells, pottery, or anything with a spiral design. But when strange events start happening in the town, with spirals appearing in disturbing places, can anyone escape their horrible draw?
If you like the weird, sometimes downright disturbing, and the bloody, then Uzumaki is for you. Uzumaki is about a town that is slowly transformed into a spiral, and the oddities and just plain eccentric-bordering-on-improbable events and people that the main character Kirie and her friend Shuichi witness.
Another thing that is shared between Manhole and Uzumaki is that the main characters are a duo trying to get to the bottom of a complicated mystery that throws everyone for a loop or baffles them once in a while. Uzumaki plays sort of like an episodic manga, but with everything tied together in a sense as everything slowly progresses to a certain point unto the end, while Manhole keeps going and adding more and more like a mystery. If you like Manhole, then Uzumaki may be a nice fit.
Power corrupts, and absolute power corrupts absolutely. Top-ranked student Yagami Light is disenchanted with the world around him. Through a series of events, he comes into possession of the ultimate power over life and death: a supernatural "death note" which can kill nearly anyone at his whim. As Light sets off on a crusade-turned-killing-spree, investigators from a police task force try to stop the mysterious deaths - including Light's own father, a senior policeman.
Hear me out. Both Death Note and Manhole are about well-planned action and essentially, a person going out of their way to change peoples' lives for better in their eyes. Both will keep you turning page after page to learn more, and death and a sort of chill embodies nearly every single page.