Ookami-heika no Hanayome

Yuurin, the daughter of a low ranking government officer, came to the royal palace after hearing of a job with higher wages. However, that job is to act as the bride of Haku Reishou, who is feared as being the ruthless and heartless "His Majesty, the Wolf." In the royal palace where conspiracies swirl, after learning His Majesty's secret, Yuurin ends up stuck being his temporary bride...!?

(Source: StarryHeaven)

Included one-shot:
Volume 2: Hoshi no Yoru ni wa Afureru Uso wo