Shizuka accepts the most perilous assassin contracts, yet she is not the one performing the kills. Instead, it is her brother, Nagi, a formidable assassin who took a bullet to shield his sister, leaving him in a coma and confined to a wheelchair. However, Shizuka has discovered the key to rousing her brother: he must be exposed to killing intent! Thus begins a violent journey of recovery, battling the most dangerous foes!