Natsume's Book of Friends (2008)

S5E3 The Letter from the Exorcist

Natsume gets a letter from Matoba, an exorcist with whom he's had a rocky history. The exorcist realm has become increasingly perilous, and Matoba is seeking Natsume's assistance. Although Natsume wishes to turn him down, Matoba blackmails him by threatening to expose his abilities to his adoptive family, jeopardizing the peaceful life he has built.