I finally read this manga and honestly I wish that I shouldn't have read it until the end because, it got me by the hook. The ending could have explained more but I guess that leaves us to interpret the ending for ourselves, i think it was never meant to give some the ending we think they deserve. I don't want to think that maybe reiji still alive with nagi because they have no good ending at all, they're like already in the abyss. They just got in it as soon as they met each other.
Overall, ts so depressing and maybe I would just read again if I want to feel the pain. Yeah, this manga pained me and I like it.