Nobara no Hanayome

Yamada Chizuru was a normal high school student... that is, until her mother left for a "journey" leaving her with a debt of one hundred million yen! As if that wasn't nerve-racking enough; Kuze Mitsuru, the Umegaki gang's Sandaime, saves her by buying her to be his fiancee!? What will become of Chizuru's days? (Source: Shoujo Crusade)

Included one shots:
Volume 1: Coffee wa Kuroi Majo
Volume 2: Tsumibukaki Madonna no Koi