At Hiromi Jounouchi's request, Chen Yu eventually brought Mikie Saegusa into his Necromantic Space and settled her in the greenhouse that was almost complete, making her the Gardener of the greenhouse.
Of course, Chen Yu's greenhouse wasn't only filled with Death Palace Roses. A large variety of magical plants grew within, forming a complete ecological cycle adjusted for their individual characteristics. Many of these plants had aggressive and dangerous traits, far beyond what a ghost who knew nothing could manage.
The real caretakers of the greenhouse were four specialized quadruped robots. Mikie Saegusa's job was simply to maintain the cleanliness of a small pavilion within the greenhouse. Even tasks like cleaning the glass were handled by robots.
After all, the vast greenhouse wasn't any smaller than a soccer field. Unless she had the time-stopping abilities of the head maid at Red Devil Mansion, completing such a task would be impossible.