Oh man, I'm getting Kurosawa vibes here. How the hell are Washizu and the other denizens of Hell going to beat the Onis with just a bunch of toothpicks? Probably through some crazy tactical maneuvers.
Though I still see the dotted "hypothetical/flashback" lines around all the panels, which makes me believe this is all in Washizu's head. Like, the Onis are a representation of Akagi's demonic strength, and Washizu being given so much power through the fact that he had a few years left in him when he died is a representation of how much power his Luck of an Emperor gives him. I hope this gets wrapped up in a few more chapters, though, I really wanna see the South 4th.