They're clearly dressing up as characters from Arakawa_under_the_bridge (since it's by the same artist as SYM), so I'm adding cosplay tags.
Before the other factions can get ahead of us the English Puritans, I must go and welcome his Lordship!This time, I've prepared appropriate outfits so that we are not seen as insolent.Come forth, Stiyl!Let us go then, Stiyl!ExtraEven preparing a real gun means that they're quite pumped up.I received an information that our Lord has decended upon the Academy City.I shall assume the look of a shepherd...This looks like we're headed to Arakawaaaa!!!Tachikawa...?