Giyuu was trying to live a normal life but it was extremely difficult since he became immortal.

He avoided people as much as possible and lived in a house in the mountains far from all human presence.

Even if he sometimes left the house to treat people or for rare errands.

Yes, he spent 100 years perfecting his knowledge in many areas related to

sciences, art and everything that has a place with culture, especially medicine.

This is why 100 years later of existence, someone knocked on his door to ask him to treat a young nobleman bedridden who would later become Muzan Kibutsuji the king of demons!

To be continued