One day Akatsuka Justice (nicknamed Seigi), a boy with a strong sense of justice, saves a man from some street punks. But the moment he touches the stone given as a token of the man's gratitude, a strange pattern shows up on the palm of his hand. The next day, when Seigi is baffled to notice that the pattern won't disappear, a mysterious girl appears before him and demands to know where he got the tattoo before suddenly attacking him.
When did I get myself
متى أقحمت نفسي في عالمٍ يقتل في الناس ويُقتَلون؟
Wie bin ich nur in eine Welt gelangt,
in der es ums Töten und getötet werden geht?
D’un coup, je me retrouve dans ce monde 
où il faut tuer ou être tué.
Come sono finito in questo mondo
in cui uccidi o vieni ucciso?
Quando eu me meti em um mundo 
onde as pessoas matam e são mortas?