I read this novel in a single day. All 7 volumes. That comes to around 1700-1900 pages. It was beyond being worth it. Originally, I was supposed to read Utsuro no Hako to Zero no Maria, but I've always been putting it off. I thought ''surely this must be a great novel with this ranking, but what if I raise my expectations too high and be disappointed?''. So it was on-hold to read for almost 6 months I believe. Then I decided to read it and I thought that one volume a day is a fair deal of pages per day. How was I mistaken. I couldn't stop myself from reading. This novel has absolutely everything I like: supernatural, psychological battles and a lot of inner and outer monologues, mystery, romance and action. They have all been mixed splendidly with each other. If you're a fan of one these genres, read this, you will be blown off your seat. If you're a fan of all these genres, please make the whole day free to avoid reading at night, because this will become one of your most favorite works from Japan. In one word, this novel is - complete. It has multiple characters with their respective personalities, character development not only of MC (by the way, his character development is one of the best I ever saw), but also of other characters. as you dig deeper into their psyche and past. Packed with complex logical and psychological deductions, as well with a lot of mysteries, it constantly kept me tinkering and mind boggling about what's gonna happen next. The supernatural and sci-fi really go hand in hand in this novel as well. If I had to point a flaw, is that it is damn finished! I really want more of HakoMari. That's all from me, I hope you pick up this novel and start enjoying it.