Skeleton Knight, in Another World - Chapter 18Volume 5 -

Before meeting Shen Xu, all Zhen Yuan wanted was to seek the dao and cultivate to the peak. After meeting Shen Xu, he thought the dao was important, but his wife was the most important.When Shen Xu transmigrated into a book, he mistakenly believed that Zhen Yuan was not a character in the original story. What he didn't expect was that his husband was the most mysterious and powerful unnamed character in the original novel.

A terrible calamity has fallen onto Zhang Fan, not only becoming one of the three survivors of Grass Temple Village, where everyone else was horribly massacred, he was also tasked to carry one of the most evil artifacts, the Sinister Bead, and taught one of the most secret teachings of the Skysong Sect, the Brahmin Wisdom. Now he cultivates in the Jadeon Sect, his knowledge and possession will draw him into a chaotic story where he will have to carry some of the greatest burdens of the Martial World.

Reincarnated as the emperor of the dynasty, Zhou Xuanji, he thought he would be rich and noble for a lifetime, but he was forced to flee the palace due to the grievances of the palace.

What surprised him was that a cheat program invented in his previous life turned out to be a reality!

At the age of two, he obtained the Red Dragon Sword, which contains the soul of the Red Dragon!

At the age of three, he obtained the second Divine Sword!

Every year you grow, there is an extra sword!

A hundred years later, Zhou Xuanji took hundreds of divine swords across the world!

Ten thousand years later, Zhou Xuanji stunned the heavens, Wan Jian volleyed into the sky, and ascended the throne of myth in the name of Sword Emperor!

- Description from novelbuddy

The story is about a man whose compulsive tendencies make it impossible for him to keep a job, and a young girl who skips school and loves insects. The two meet, come to support each other in reintegrating into society, and fall in love. There’s a problem, however: namely, the parasites in their heads.