Akame Ga Kill!: Song of the Dark Shura

How did the former protagonist, Tatsumi, end up as a comic-relief character? And why is he doing chores for the real protagonist, serving tea and water? He keeps getting bullied, too... Could it be... Tatsumi is a masochist?

When the pitch-black Asura takes up his blade once more and gazes at his enemies with eyes full of blood and hatred, this time his foes are not just the Imperial Capital, but the entire world...