Mai Aoe

Kuon's mother, and a Yuki-onna.
Although she is quite old, because of her demi-human characteristics she looks to be about twenty.
At a glance, she looks like a lady, but she quite likes sex.
Her husband is a vampire's true ancestor, but for the majority of the year, he remains asleep so she's quite bored.

She is so youthful that it's hard to believe she's a married woman with a child.
She is one of the four chairmen of the IDF (International Federation of Humane Societies) and is the acting head of the Aoe family.
She became acquainted with Taichi through the incident with the magical element.
She was trying to trick Kuon become Taichi's daughter-in-law, but Kuon and the others fell into a coma. And in order to wake her up, she needs the "All-Purpose Holic Milk" that can be squeezed by pouring magic into a demi-wife.
The fact that she is a candidate for this position makes her aggressively approach the protagonist.

(Source: VNDB)