Joker Vol.1: Wake up ambiguous devil

When the king dies, his power-hungry brother locks up the princess and rightful heir to the throne so he can become king, afraid someone will find out what he did, he hires the best assassin he can find, unaware that he has just started a succesion of events, that will mean his end. Bringin up upon him, the unstopable assassin fueled by chaos, the one that will and can do anything, Joker.