This story was inspired by the Kobe child murders of 1997 that a 14-year-old "Boy A" ("Shōnen A") killed and decapitated several children.
这个故事由1997年的神户连环儿童谋杀案启发，在这起案件中一位14岁的男孩“少年A”杀死了为数众多的儿童并对其进行斩首。