Shizuka accepts the most perilous assassination contracts, yet she is not the one performing the kills. Instead, her brother Nagi, a formidable assassin who was shot while shielding his sister, carries out the work. The injury left him in a coma, confined to a wheelchair. However, Shizuka has discovered the method to rouse her brother: he must be exposed to killing intent! This initiates a violent path to recovery, fighting against the most dangerous adversaries!