Nakayama Masaaki is great at creating tension and making you paranoid. I really enjoyed Fuan no Tane (and its sequel). I've heard great things about Kouishou Radio, too, though I haven't read it yet.
https://www.mangago.me/read-manga/fuan_no_tane/
Obviously Junji Ito is a must read. My favorites I'd say are Weeping Woman Way and Human Chair.
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