You ignore it. It’s as simple as that. You pretend it’s not there and you proceed to enjoy whatever else the show is offering. Pretty sceneries, a fantasy realm, and a frail protagonist that is slowly exploring it. Here lies the second turn-off point that halves the audience for a second time. Those who are content with a very simple slice of life in a magical realm type of story will find it very good. Those who want something other than that will be bored out of their minds, for there is nothing much going on in terms of plot. Yes, the heroine is exploring the fantasy realm, but that is more of a simple excuse to have world building. There is no real objective since it’s just whatever magical thing she encounters on an almost episodic fashion and what she learns about that something, often through infodumps by the magus or one of his associates. She otherwise has no agency or urgency over what is going on around her. Because she is a slave, bought to be the magus wife. You see how the same problem keeps appearing?
That aside, the show doesn’t really do much with its own premise, which is not ‘the daily life of my future slave wife’. It was a tortured girl getting to live with a tortured magician, both of which had felt alienation. They were supposed to help each other overcome their emotional baggage by one offering what the other lacked. This doesn’t go anywhere. In fact, it’s almost forgotten and all you are left with is a no-stakes tour around the magical land of the magus. Which can be pretty to look at and learn more about if that is all you expect, but lacks any real meaning and it certainly is not what the premise promised the viewer. There is no danger, no stakes, no worry about the characters failing and ruining everything they were trying to achieve. The protagonist often comes off as a Mary Sue with a super magical ability that fixes everything right away and with no real effort. If that doesn’t work from time to time, then the magus will be the one who jumps in to deflate the tension with his own super hax magic. The show is constantly assuring you there is never going to be something terribly bad in their lives or that they will ever going to mature through their mistake and struggles. Because they never have to struggle; it’s a show you are watching to relax. Assuming you can remain relaxed while knowing the heroine is a slave who was bought to be someone’s wife.
Thus, as a whole, this anime is vapid air. It doesn’t give you what it promises, it doesn’t build on what its premise was implying, and it promotes slavery as fine if you treat your slaves nicely. Before you marry them.
