I just read 5 chapters, was really captivated a d wanted to write down some of my thoughts before I go to sleep. I strongly disagree with the main character's view of himself and the world, but it reminds me a lot of a depressed person I knew. It feels like the author must have experienced depression himself or saw it in someone they are close with. I'm sure this is more powerful to someone who had similar mental health issues but even if on do not, it's still an interesting reading experience. As for the premises, part of me wants to analyze the mechanic but soon realized that's meaningless. A supernatural mechanic is not something to be taken apart using conventional logic. It is quite interesting to think about the implications. It raises many questions, for which I have my answers and it's interesting to see another side
Edit: I ended up staying up all night reading this to the end. This might be one of my favourite manga now.