Aerlev

Getting transmigrated inside a novel is not really a bad thing—you know the story, you have the power of the future in your hand, you know all the hidden keys. You might as well end up as the most powerful and omniscient being in that world.

That is, if you don’t wake up during the epilogue.

And yet I find myself in the body of a fallen priest at the end of the novel, a tragic hero who had his mana circuit broken in the last war, being shunned, drown in debt, and destined to die not long after. 

Fortunately, I know just the cure.

Unfortunately, the cure was in the hand of one of the Demon Lords—you know, the race that my kingdom just wage war with.

Would he give me the cure if I asked him politely? There’s no harm in trying, right? I’d die if I didn’t get the cure, anyway.

“Sure, but you have to be my bride as the price,” the Demon Lord said.

...huh? Sir, you know I’m (technically) a priest, right?

The Demon Lord’s Bride (BL)

Demon letter?! Did Sore just say demon letters? In a human's diary?

It was just surprise after surprise.

"Ah, I did teach him our letters," Aunt Nezja said. "I thought it would be good for us to have this kind of exchange."

[However, it was only the letter. When I read it, it did not make sense in demon tongue]

[It was human language written with demon letters]

At that moment, Aunt Nezja gave us enlightenment. "The code..."

Oh! Right--Sagan did mention that some information was written in a code. He just didn't know that it wasn't a code but a demon letter. Unlike in the other realms, the church strictly prohibited humans from learning or even knowing demon letters, so even a scholar like Sagan probably had no idea.

Not to mention, Aunt Nezja was probably teaching Sangen the archaic form of the demon letters, not the widely used common ones.

The eighty kids' wetdream