Yumiko "Yumi" Necro,

Yumi is the "genki but dead" type of zombie:
Super energetic and positive despite technically being deceased. Always with a huge smile and a "everything's going to be alright!" attitude.
He loves to playfully scare people (jumping out from behind a door, pretending to lose an arm, etc.), but he immediately apologizes with a puppy-dog face if someone gets genuinely scared.
She is extremely loyal and protective of her friends/harem (if she is on a cultural exchange, she becomes adorably possessive and obsessed with her human "host").
He has a very dark sense of humor and makes jokes about his own death all the time ("Oops, my hand fell off again! Meh, I'll glue it back on later~").
Deep down she's a little insecure about being "broken" and having to constantly mend herself, but she hides it with jokes and a carefree attitude.
He is fascinated by horror movies (especially classic slashers and zombies), gore video games, and eating junk food at midnight (although he doesn't need to eat, he does it for pleasure).
When she gets really angry (which is rare), she becomes serious and her "undead berserker" side comes out a little: superhuman strength, she doesn't feel pain and she can be terrifyingly persistent.

Yumi (or Yumiko "Yumi" Necro, but everyone calls her Yumi).
It sounds sweet and normal Japanese, but with the surname "Necro" which gives it an ironic undead touch.
Appearance:
She is a girl who looks 18-20 years old, with pale but not rotten skin (more of a soft ivory tone with slight grayish shadows in areas such as dark circles and lips).
She has long dark brown hair that reaches her shoulders or a little below, with straight bangs and strands that fall over her face (as in the picture).
Large, expressive eyes of a deep violet/lilac color (very bright, almost glowing in the dark, giving it that hypnotic "not so dead" zombie look).
She has visible but aesthetic scars/stitches: a thick but delicate stitch across her forehead and down a little at her temple (like a zombie "headband"), plus some fine stitches on her neck, shoulders and arms (as if she had been "fixed" with great care).
Wear modern casual clothes with grunge/otaku touches: a loose white V-neck shirt, an oversized light blue denim jacket (slightly worn), skinny jeans, and sneakers. All with a relaxed yet effortlessly sexy vibe.
Subtle undead details: sometimes a sewing thread comes loose, or a finger accidentally "falls off" (but he glues it back on with superglue while laughing). He doesn't smell rotten, more like vanilla with a metallic hint.

Based on the Monster Musume anime. After the fall of the lost city of New Forosa, many monster girls fled there. Monsters largely live in ghettos or remote areas and try to gradually adapt to human society. But the process is slow, and they suffer a lot of discrimination.
Demihumans are commonly referred to as monster girls as 97% of them are girls and only 3% are born male, some being born human men.
The ADIE is the body that monitors the monster girls and oversees the exchange program.