Reiji just go back to Nagi and figure out how not to unalive yourselves. Drop this murder shit, this darkness will not allow you to escape your abyss, especially when Nagi didn't even ask this of you. I'm sure that poor girl would feel a hundred times better about her pain and her situation if she just stayed in the warmth of your arms.
I really wanted a happy ending for this story and for a while I had hope that we might actually get it, but with these last 7 or 8 chapters or so, it's starting to feel like it'll be a very empty and unsatisfying ending with no real salvation for anyone. Hoping this is not the case, please Ryo or whatever your name is author-san 🙏