Comment by Choco on Tsuki ga Michibiku Isekai Douchuu - Chapter 86

@Choco I'm thinking because his parents had high profiles and she was nobles they knew of them

@Choco MC's dad was the prince, right? If she was a noble from the same country, it makes sense she knows the prince, right? And the prince marrying the high preistess was probably big news too.

@Choco she's a fallen noble his mom is a priestess dad an adventure of that conutry

@Christopher McGovern I haven't read the novel in a while but I'm pretty sure that Eva is a former noble of the same country from which MC's parents hailed from originally. MC's father was a noble, turned adventurer after a massive demon incursion, and his mom was a high priestess also turned adventurer for the same reason. They then isekai'd into our world and raised a family there. AFAIK none of them were royalty, just counts or something like that. They likely saw eachother at noble events, hence why she was familiar with them.