I am modifying myself into the ultimate demon.

The bad news: I've been hit by a ghost curse, and I could turn into a ghost at any moment. The concubines are still here, but I'm not allowed to be human? 【Analyzer: This is no ordinary ghost curse; it is a Ghost Fetus. 】 "A Ghost Fetus? Then will it crawl out of my body once it grows up?" 【Yes! Do you wish to modify your bloodline and fuse with the Ghost Fetus? 】 "Do I even have a choice? Modify!" ... This is a world where demons and monsters roam free. Red lanterns in ancient mansions, paper figures performing ghostly plays, white silk nooses for the hanged, and evil immortals enshrined in ruined temples. I only wanted to be a wealthy young master in peace, but... there are always demons trying to harm me. I had no choice but to constantly modify myself, fusing with a hundred ghosts and ten thousand demons... until one day, every monster and ghost feared me. Because I had become the Ultimate Demon!