The Severing Crime Edge anime
Kiri Haimura is obsessed with beautiful hair, and specifically cutting it. This strange trait leads him to search for a long-haired ghost that lives in an abandoned house high up on the hill. He finds Iwai Mushanokouji (the “Hair Queen”), a beautiful girl with long flowing locks. Her hair is not cut because of a curse in her family.
Iwai tells me that there is a death game around her and that if she’s killed by a cursed object (aptly called a Killing Good), the wielder will get their wish granted. He protects Iwai against “Authors”, which are Killing Goods users. However, he discovers that there is actually a Killing Good in his family. It is a pair of scissors his ancestor used to murders. He renames the scissors “The Severing Crime Edge” and he’s able to cut Iwai’s cursed hair using them. This allows her to lead a normal lifestyle. Kiri must protect the Hair Queen from many Authors.