Reikoku Onzoushi Wa Mikomori Kon Wo Goshomou Desu!

Reikoku Onzoushi Wa Mikomori Kon Wo Goshomou Desu! summary:

Chiharu Saeki is just your average woman working in an office... except she has a loan to pay after her father's company went bankrupt. One day, the young heir to one of the biggest companies around, Ritsu Kaido, is told that the only way he can inherit the company and his father's fortune, is if he were to marry Chiharu. Even without love in this marriage, there must be a way to make this work... is what Chiharu thought until she learns that Ritsu has a secret lover?!