Nemurenai no wa Tsuki no Sei

Insomniac CEO x Poor Girl: I'll sleep with you to settle your debts...! Asahi, who works at a toy company, works hard to pay off her father's debts. However, her father takes out a new debt of 10 million yen and disappears. Kicked out of her apartment and at a loss, Asahi secretly stays at the company, but is found by the cold-hearted CEO Omi. "If you sleep with me, I'll give you 10 million yen," the CEO suddenly proposes, and they end up living together...!? (Source: Kodansha, translated)