Kobayashi-san Chi no Maid Dragon

Synopsis

As Tohru is faced with the inner turmoil over what would happen if she were to become separated from Kobayashi, her father, the Emperor of Demise, suddenly appears and drags her back to her world. After Kanna informs her that Tohru will likely be unable to return, Kobayashi struggles to get used to a life without Tohru. Some time later, Tohru escapes the other world to reunite with Kobayashi, but is quickly pursued by her father. Noticing Tohru's wishes to stay by her side, Kobayashi stands up to her father despite his overwhelming strength. Encouraged by Kobayashi's resolve, Tohru prepares to confront her father in battle, but Kobayashi gets between them, asking the father to have faith in his daughter's wishes and convincing him to leave her be. As life returns to normal, Kobayashi invites Tohru and Kanna to meet her parents.

(Source: Wikipedia)