From Kadokawa BookWalker:
When a boy with scissors meets a girl with beautiful long hair, the tale of the Killing Goods is set in motion!
Kiri Haimura, a boy whose hobby is cutting girls' hair, is just passing by an old mansion on his way home from school when he meets Iwai Mushinokoji, a girl with beautiful long hair. When Kiri's scissors cut Iwai's "uncuttable" hair, the tale of the Killing Goods is set in motion! A tale of boys and girls descended from cutthroat killers, drawn by the incomparable Tatsuhiko Hikagi!