Dogs Vol. 2 (manga)

In her search for the assassin who "stole her past," Naoto follows Heine and Badou to go see the head of one of the Underground's gangs. But what starts out as a simple quest for information ends up as a rampageous firefight. And just when it seems things couldn't get worse, the Hardcore Twins, Luki and Noki, show up to "play." Which is when things really get interesting…