From Chibi Manga:

Sixteen year-old high school student Noda Tsubasa finds her ordinary life upended when she discovers that her parents have betrothed her to a millionaire to settle their ginormous debt. The last thing Tsubasa wants is to marry some old geezer, so she channels the Runaway Bride on her wedding day, but her great escape is foiled by a guy who turns out to be...

( NOTE: Compilation of Short Stories:

Junai Bride
A normal high school girl will become... the fiance of a son of a noble family?!

Junai Honey
It's so nice to be a girl. We said that we're honest, and that when we smile, we are so cute. That guy used to say the same things to me, but is that really a good thing...?!

Junai Produce
A popular idol will fall in love with her manager...?!

Datenshi no Kiss
One day, a handsome angel appeared in front of me. It was the christmas eve and a cute love story started...)