Sorcery
Noun and の adjective
まじゅつ
「好き嫌いしないの！黒魔術だけじゃなくて白魔術もちゃんと勉強しなさい！」「はいはい。いつも同じこと言ってるよね。」「"はい"は一回でしょ！」
"Don’t be so picky! You shouldn’t just study black magic, but white magic too!" "Yeah, yeah. You always say that." "One yeah is enough!"
The devil art is black magic and sorcery. The kind of things that devils do.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.