It would be great if there was an explanation for why the diary was out of the island... Like, if he put it there for Mari whatever her name is, so she is cursed, I would understand.
And support.
Thanks for the chapter, though I agree with the other readers that it makes no sense that the MC would have left the diary just lying around for anyone to get to.
with how you've portrayed the MC so far this is beyond ridiculous. it would be fine if MC is such a careless short but he wasn't so this is just stupidly forced for the plot and as far as that horcurx work, it couldn't teleport itself nor could it entice anyone on its 'sleep' or standby state.