God fuck this is kinda hard cuz I have so many favorites that I love for different reasons. Like Ib was my first and is a classic, I literally bought the remake before it even came out in English. It literally is why I fucking love psychological horror so much. There's also Yume Nikki and although I don't count it as a horror Angels of Death/Satsuriku no Tenshi both are so good. Yume Nikki just, the atmosphere man. And satsuten the characters are all so fucking good I love crime sibs Rachel and Zack sm.