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This series was cancelled by the publisher (naturally at a cliffhanger point). There are apparently no plans to ever finish the story.

Kanoko Ooba is the 1 billion girl. After her family's Japanese confectionery shop goes bankrupt it is saved by a stranger. The total debt of 1 billion is paid in exchange of marrying one of the owner's three daughters to the stranger. Wanting to save her family though she was overworked and almost uncared about, Ooba volunteers for the marriage. Now she finds herself in luxurious house with a butler, a goat named Mama no.3 and the erotic novelist writer Taiga Houjou. Will love spring between the two of them or it will remain at a point blank?

From ShoujoMagic:

For heroine Ooba Kanoko, life isn't much fun. Her family runs a small restaurant, where she slaves and is horribly mistreated by her two sisters, parents, and grandfather. (Not to mention the fact that her name said aloud as "Oobaka no ko" = "stupid kid"!) Poor Kanoko cooks, cleans, and takes the blame when things go wrong. However, her life takes an unusual turn when her family suddenly loses what little money they had, and everything they own is about to be repossessed -- along comes a ragged looking, tall stranger with an interesting proposition that will turn Kanoko into a billion dollar Cinderella! At a price to Kanoko...

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