I support the Uboa=Mado's father, Poniko=Mado's mother... theory.

Poniko ignores ( or doesn't dare to look at her ) Madotsuki. I think the house is hard to reach, maybe she tries to forget her parents.

Kill Poniko, Uboa will appear.
Uboa will appear every now and then, anyway.
(not original) If she so much as touches him, he will beat her unconscious. She may also vomit blood, represented as Zoroark in Uboa's Semenland.
Uboa scares Madotsuki. He will lock the doors and then begin to yell at her. That Uboa scream, you know.

Perhaps i forgot some points, but that's the basic idea.

(pic not actually related)

>>	Canta 11/08/09(Tue)12:01 No.3113   [Delete]   [Edit] File: 1312916493016.jpg -(37.5 KiB, 483x292) Thumbnail displayed, click image for full size. >Kill Poniko, Uboa will appear. >Zoroark >Semenland. Last edited 11/08/09(Tue)13:37.

>>	Anonymous 11/08/09(Tue)13:30 No.3115   [Delete]   [Edit] File: 1312921816092.png -(136.5 KiB, 300x375) Thumbnail displayed, click image for full size. Poniko is an intergalactic space whore that fled to earth to escape the vice grip of her pimp daddy Uboa. Last edited 11/08/09(Tue)15:12.