Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Chapter 533 - 17-45. Demon God's Castle

Xia Yuqing is a shut-in+fujoshi from the 21st century. After an accident, she transmigrates into the body of a young princess forced into a political marriage to another country.

“W-where is all this blood coming from? Is this– Is this nose blood? AH, YOUR HIGHNESS! A-are you alright? What? No! You mustn’t! Princess Xia, please, come back!”

“… I… need… to… see…”

The aide could only helplessly look on as Princess Xia Yuqing crawled towards the emperor’s quarters, leaving a trail of blood in her wake.

Fujoshi: a term for a woman who enjoys reading about relationships between men.

- Description from Novelupdates

The protagonist, Inaka Yuuji, was run over by a truck because his awareness was dulled from overworking.

“Ahー, with this I don’t have to work so much anymore. I want to spend my next life leisurely……”

was the wish Yuuji blurted out. He met God and it was decided that he will be reincarnated in the countryside of the otherworld. He became Alfred Slowlet, 2nd son of a countryside noble. Will he be able to enjoy and leisurely spend his slow life in the countryside?

The end of all worlds approaches.

The Demon King Order harvests lives from all manners of living beings.

Within this darkness full of despair,
A single person escaped from space-time, returned to before the world collapsed, determined to change the fate of the past.

But as time pass, he gradually finds out that the Apocalypse isn’t quite as simple as he thinks…

- Description from novelupdates

Among the demons, the supreme ones are called “Great Saints.”