Kid shouldn't tell Ryuk to not contact him under any circumstances. He might still get away with it if only he knew about the rule. Oh well, fucked by a quickpatch.
I have no idea why is this even popular. It's just a standard power fantasy that rivals even the most bottom tier of isekai stories despite not being one. The art is decent, but it's definitely not enough to compensate for the lacklustre plot and characters. Not my cup of tea.