Intro. Hei, the bodyguard of the mayor of Siesta City. He has considerable attainments in covert operations, reconnaissance and counter-reconnaissance, wilderness survival and the use of crossbows. The fighting skills displayed by Hei are not like those that a bodyguard can master. Although the crossbow in her hand is the main means of attack, in fact, for her, books, pens, ropes, there seems to be nothing that cannot become a weapon in her hands. Moreover, she lacks a sense of valuing her own life and body. In various battles, her attack methods are often unpredictable, but they are often achieved only after paying an almost irreparable price. In daily life, Hei also shows a personality similar to her fighting style. She is taciturn and unsmiling. Even if someone takes the initiative to communicate with her, she usually only gets a cold response.