Maou-sama, Kekkon desu!

Synopsis

Komako Hino is a marriage counselor who'd given up on her own happiness, until she was suddenly transported to another world! "Could it be... me with this hottie!?" Komako's heart soared at the sight of the handsome Demon Lord waiting for her, until he asked her to help with matchmaking instead!? But the Demon Lord seems to have a secret he won't tell Komako...? (Source: ShuCream, translated)