I feel that this is leading to an ending where he really is insane.
...Like think about it, fantasy waifu suddenly shows up outta nowhere, magical healing spider, writing in a journal.. like who the fuck writes in a journal nowadays?!
I'm still bothered that by the sheer coincidence of the mystery girl turned spider's organs being removed and another serial murder case involving two psychopathic art students' chance meeting both happening simultaneously in the same general area. I'm glad at least they didn't gloss over the MC's male friends death and funeral. Guy may have been the only sane and nice person in this manga.