the moment the mc and well,, the girl hikari revealed their scheme and their bat shit concept of 'judge', i was severely dissapointed. like, i already saw it coming! how it unraveled was dissapointing as well, and although MC was at least good at acting nice, it's so lame how the whole plan was revealed in the end? maybe it's because of the length of the manga itself? would have loved to see more of how they come up with the scheme, how they drugged all these people and brought them, only the two of them bringing around 18 people on one building, and how they got the mask ideas ... how their mind work when the whole plan finally takes place ... and so on.
the concept of seven deadly sins and the use of trippy masks was smart, but the characters weren't even using it for the most part of the story!! it would've been more creepy if the characters stayed anonymous throughout the story, with their mask on. the ones in the next room, though, why were they all wearing suits? and why did they all wear masks while in judgement? and the locks, too, what was up with that? why is it different from the MC's side? was it a large hint that even if they both have the same reason to kill these people, in the end, hikari's motive and revenge was different from MC and he would later be bertrayed by her? (I knew it would happen tho, so again, very predictable)
overall, apart from the cool concepts and the 'reality' of the plot besides the phycopathic MC and heroine (do i even call her that?), it was just very edgy and trippy, but other than that, a bit of a letdown.