I predict the sister is the black magic the mages summoned with all the sacrifices. ヽ(`Д´)ノ
If you want more Opera with their hair down, go to chap 307 ლ(´ڡ`ლ)
I love opra and their ambiguous air around it’s just so perfect a mystery but I don’t have any urge to think about more of opera than Opra being Oprah if that makes sense
I predict the sister is the black magic the mages summoned with all the sacrifices. ヽ(`Д´)ノ