Velvet Kiss

is a manga series written and illustrated by Chihiro Harumi. It is serialized in Takeshobo's magazine Vitaman since 2009.

Plot
Velvet Kiss is about Nitta Shin, a salaryman who unwittingly signs a contract that gets him into an 80 million yen debt. His creditor has Nitta keep a certain woman "company" in order to pay off the debt.

Other Sources

 * Wikipedia