Butsumetsu Kekkon

This is the last stronghold for those who are unable to find a partner... One day, Sekiguchi Makoto, who has lost his job and been dumped by his girlfriend, meets Butsumetsu Seishiro, the president of the Butsumetsu Marriage Agency, and decides to join the company. He thinks it's a noble job that makes people happy, but in reality it's a place to take in "marriage refugees" who are covered in lies...!?

(Source: Comiplex, translated)