Hisui (CV: Oosaka Ryouta) is a member of the Fukuro who actually has the same power as Tsugumi but can actually control it into a sort of fire power. He’s half Japanese and loves reading books and studying foreign languages. He also likes touching hair, I guess it’s his own turn on, lol.
Tsugumi is a sheltered girl who witnesses an accident with her brother due to a cursed book. From there, she joins this group known as the “Fukuro/Owls” in order to uncover the mystery of these books and her journey starts there. So this is a story which takes place around 1913, I believe. Basically a Taisho era story of mystery and suspense.