Knew I'd seen this somewhere (Recognized Hirano's style and the tone of the dialogue). This is direct parody of the final page of 'Drifters' (Hirano Kouta) volume 2 chapter 6 (chapter 17 overall). It parodies, the style, panelling, speak bubbles and dialogue. Everything, even the placement of 'TO BE CONTINUED' (Technically even the context is similar, although much less dark).