Looks like the "pets" are actually sharing things with the gutter trashes (giving them a blanket, food). Of course, I say "pets" because it looks like these strips of them taking it easy is what's being imagined by the Marisa from post #19999 and post #19885 and what she wanted to happen (exact same types and numbers of koyukkuris, the food bowls, etc).
Or actually that could just be a safe place and Marisa is leaving a trail so mister can find them when he comes home. Yeah, gonna need a translation to figure it out.