Tatsuya Endo has continued to weave an intriguing yet endearing espionage comedy fantasy with Spy x Family, but its unlikely telepath Anya Forger can’t read everyone’s mind. Much of the plot focuses on how the Forger family upholds their cover despite their lack of blood ties. Still, Anya wishes, above all else, to stay where she is by helping Loid. Loid’s mission, Operation Strix, requires him to get close to Donovan Desmond, an elite politician and former leader of Ostania. However, some of the Desmond family might show signs of immunity to Anya’s telepathy in Spy x Family.

https://screenrant.com/spy-x-family-theory-explain-anya-cant-read-demetrius-desmond-mind/